Convenience of men (5)
I believe the answer is:
gents
I believe this is a double definition.
'convenience' is the first definition.
(I've seen this before)
'men' is the second definition.
(gent is a kind of man)
'of' is the link.
(Other definitions for gents that I've seen before include "Men (colloq.)" , "Male loos" , "Public convenience" , "toilet" .)