Men short of urgent supplies? (5)
I believe the answer is:
'men' is the definition.
(gent is a kind of man)
'of urgent supplies?' is the wordplay.
'of' indicates a hidden word.
'GENTS' can be found hidden inside 'urgent supplies'.
'short' acts as a link.
(Other definitions for gents that I've seen before include "toilet" , "Male loos" , "Public convenience" , "Men (colloq.)" .)