Player is wearing tight boot (6)
I believe the answer is:
oboist
'player' is the definition.
(oboist is a kind of player)
'is wearing tight boot' is the wordplay.
'wearing' means one lot of letters goes inside another.
'tight' is an anagram indicator (tight can mean drunk).
'boot' is an anagram of 'obot'.
'is' going inside 'obot' is 'OBOIST'.
(Other definitions for oboist that I've seen before include "Musician who plays woodwind of treble pitch" , "orchestra member" , "Player of woodwind instrument of treble pitch" , "Do I boost the musician?" , "Wind player" .)