American singer depressed meets Charlie Parker (8)
I believe the answer is:
bluebird
'american singer' is the definition.
(I've seen this before)
'depressed meets charlie parker' is the wordplay.
'depressed' becomes 'blue' (I've seen this in another clue).
'meets' says to put letters next to each other.
'charlie parker' becomes 'bird' (jazz saxophonist nicknamed 'Bird').
'blue'+'bird'='BLUEBIRD'
(Other definitions for bluebird that I've seen before include "US flier (but never seen over the white cliffs of Dover)" , "Fast car - or boat" , "Donald Campbell's speedboat - relative of thrush" , "Famous speedboat" , "American member of thrush family (seen over Dover?)" .)