Player this person dressed in new boots (6)
I believe the answer is:
oboist
'player' is the definition.
(oboe player)
'this person dressed in new boots' is the wordplay.
'this person' becomes 'I'.
'dressed in' means one lot of letters goes inside another (inserted letters are dressed in others).
'new' indicates an anagram.
'boots' anagrammed gives 'obost'.
'i' placed into 'obost' is 'OBOIST'.
(Other definitions for oboist that I've seen before include "orchestra member" , "Do I boost the musician?" , "Musician who plays woodwind of treble pitch" , "Instrumentalist" , "Wind player" .)