Partners covering court pass out (5)
I believe the answer is:
swoon
'pass out' is the definition.
('swoon' can be a synonym of 'pass out')
'partners covering court' is the wordplay.
'partners' becomes 'sn'.
'covering' means one lot of letters goes inside another.
'court' becomes 'woo' ('woo' can be a synonym of 'court').
'sn' enclosing 'woo' is 'SWOON'.
(Other definitions for swoon that I've seen before include "Show ecstasy" , "experience ecstasy" , "Faint (with emotion)" , "Display of extreme emotion" , "Lose consciousness" .)