Liaisons in a toilet women are unlikely to frequent? (6)
I believe the answer is:
agents
'liaisons' is the definition.
'a toilet women are unlikely to frequent?' is the wordplay.
'toilet women are unlikely to frequent?' becomes 'gents'.
'a'+'gents'='AGENTS'
'in' acts as a link.
(Other definitions for agents that I've seen before include "Representatives" , "They operate on behalf of others" , "Instruments" , "Sales reps" , "They do business on behalf of others" .)