Cancel visit that's not working (4,3)
I believe the answer is:
call off
'cancel' is the definition.
(I know that cancel can be written as call off)
'visit that's not working' is the wordplay.
'visit' becomes 'call' (call is a kind of visit).
'that's not working' becomes 'off' (I've seen this in another clue).
'call'+'off'='CALL OFF'
(Other definitions for call off that I've seen before include "Abandon" , "Cancel - summon away" , "Cancel or terminate - shout away" , "Order to desist" , "Cancel, order not to proceed" .)