Unconscious, exhausted, eclipsed (7)
I believe the answer is:
outdone
'eclipsed' is the definition.
(I've seen this in another clue)
'unconscious exhausted' is the wordplay.
'unconscious' becomes 'out' (similar in meaning).
'exhausted' becomes 'done' (I've seen this in another clue).
'out'+'done'='OUTDONE'
(Other definitions for outdone that I've seen before include "Excelled" , "Gone one better" , "Surpassed" , "beaten" .)