Examine love of prohibition (4)
I believe the answer is:
veto
'prohibition' is the definition.
(I've seen this before)
'examine love' is the wordplay.
'examine' becomes 'vet' (I've seen this in another clue).
'love' becomes 'o' (love means zero in tennis).
'vet'+'o'='VETO'
'of' is the link.
(Other definitions for veto that I've seen before include "Stop" , "Forbid; prohibition" , "Authoritative prohibition" , "negative result" , "Reject - ban" .)