Removing son during pleasure trip (7)
I believe the answer is:
ousting
'removing' is the definition.
(ousting is a kind of removing)
'son during pleasure trip' is the wordplay.
'son' becomes 's'.
'during' means one lot of letters goes inside another.
'pleasure trip' becomes 'outing' ('outing' can be a synonym of 'pleasure trip').
's' inserted within 'outing' is 'OUSTING'.
(Other definitions for ousting that I've seen before include "Evicting" , "ejecting" , "Turfing out" , "Driving out" .)