Dance ace eclipsed by chief star (5,4)
I believe the answer is:
bossa nova
'dance' is the definition.
(Brazilian dance)
'ace eclipsed by chief star' is the wordplay.
I cannot really understand how this works, but
'ace' could be 'a' (abbreviation) and 'a' is located in the answer.
'chief' could be 'boss' (synonyms) and 'boss' is found in the answer.
'star' could be 'nova' (nova is a kind of star) and 'nova' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for bossa nova that I've seen before include "steps taken" , "Brazilian music, rhythmically related to the samba" , "Dance from Brazil similar to samba" , "Brazil's measure" , "(Music for) a Brazilian dance" .)