The woman's supporting American doorkeepers (6)
I believe the answer is:
ushers
'doorkeepers' is the definition.
('usher' can be a synonym of 'doorkeeper')
'the woman's supporting american' is the wordplay.
'the woman's' becomes 'hers' ('her' refers to a woman).
'supporting' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'american' becomes 'us' (abbreviation for United States).
'hers' after 'us' is 'USHERS'.
(Other definitions for ushers that I've seen before include "Court officials" , "They show you to your seat" , "Escorts" , "They escort people to seats" , "Officials stationed at the entrances of courtrooms" .)