Jeer Tom perhaps prior to visit (7)
I believe the answer is:
catcall
'jeer' is the definition.
(I've seen this before)
'tom perhaps prior to visit' is the wordplay.
'tom perhaps' becomes 'cat' (a tom is a male cat).
'prior to' says to put letters next to each other.
'visit' becomes 'call' (synonyms).
'cat'+'call'='CATCALL'
(Other definitions for catcall that I've seen before include "Jeer" , "Feline whistle of disapproval" , "Shout of derision" , "Audience's expression of disapproval" , "Derisive call" .)