Player is wearing repaired boot (6)
I believe the answer is:
oboist
'player' is the definition.
(oboe player)
'is wearing repaired boot' is the wordplay.
'wearing' means one lot of letters goes inside another.
'repaired' is an anagram indicator.
'boot' is an anagram of 'obot'.
'is' put inside 'obot' is 'OBOIST'.
(Other definitions for oboist that I've seen before include "Wind player" , "Instrumentalist" , "Player of woodwind instrument of treble pitch" , "Do I boost the musician?" , "orchestra member" .)