Deleting unnecessary services from %desktop-services

[znavko]

Hello, Guix Help! Today I have a time to renew my attempts removing networkmanager, cups, avahi-daemon, ntpd.

Pierre Neidhardt advised here https://lists.gnu.org/archive/html/help-guix/2018-09/msg00079.html but now my config looks like this:

  (services (cons*  ;;(tor-service)
                    (service postgresql-service-type)
                    (xfce-desktop-service)
                    (modify-services %desktop-services
                        (elogind-service-type
                            c => (elogind-configuration
                                (handle-lid-switch 'ignore)))
                    );;end of moify desktop-srvices
  ));;end of services

When I try function (remove), I have an error

  (services (cons*  ;;(tor-service)
                    (service postgresql-service-type)
                    (xfce-desktop-service)
     (remove (lambda (service)
               (eq? (service-kind service) network-manager-service-type))

                    (modify-services %desktop-services
                        (elogind-service-type
                            c => (elogind-configuration
                                (handle-lid-switch 'ignore)))
                    );;end of moify desktop-srvices
);end of remove
  ));;end of services

# guix system reconfigure /etc/config.scm
/etc/config.scm:86:20: error: remove: unbound variable
hint: Did you forget `(use-modules (srfi srfi-1))'?

And when I add it, guix requires module networking, but adding of it gives:

# guix system reconfigure /etc/config.scm
guix system: error: service 'ntpd' requires 'networking', which is not provided by any service

Is it possible to delete these, and how?

Also, how to rescue my system when I will not have a possibility to use network at all. How then use usb-stick with guixsd and reconfigure my system with my previous config?