Athlete, exhausted and quiet, having not qualified (4-6)
I believe the answer is:
shot-putter
'athlete' is the definition.
(shot putter is a kind of athlete)
'exhausted and quiet having not qualified' is the wordplay.
'exhausted' becomes 'shot' (I've seen this before).
'and' means one lot of letters go next to another.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'having' is a charade indicator (letters next to each other).
'not qualified' becomes 'utter' (utter can mean completely ie unqualified).
'shot'+'p'+'utter'='SHOT-PUTTER'
(Other definitions for shot-putter that I've seen before include "Field athlete" , "Athlete hurling heavy metal ball" , "sportsperson using strong-arm tactics" , "Athlete throwing heavy ball" .)