Support for men only available ultimately behind the scenes (9)
I believe the answer is:
backstage
'behind the scenes' is the definition.
(I've seen this before)
'support for men only available ultimately' is the wordplay.
'support' becomes 'back' (back is a kind of support).
'for men only' becomes 'stag' (I've seen this before).
'ultimately' indicates one should take the final letters.
The final letter of 'available' is 'e'.
'back'+'stag'+'e'='BACKSTAGE'
(Other definitions for backstage that I've seen before include "dressing room area" , "away from public view" , "out of the limelight" , "Wings etc" , "Behind the scenes (theatrically)" .)