Musician, odd chap associated with tango (9)
I believe the answer is:
trumpeter
'musician' is the definition.
(trumpeter is a kind of musician)
'odd chap associated with tango' is the wordplay.
'odd' becomes 'rum' (I've seen this before).
'chap' becomes 'peter' (Peter is a man's name).
'associated with' means one lot of letters go next to another.
'tango' becomes 't' (phonetic alphabet: alpha, bravo, charlie etc.).
'rum'+'peter'='rumpeter'
'rumpeter' put after 't' is 'TRUMPETER'.
(Other definitions for trumpeter that I've seen before include "kind of pigeon" , "One touting own skills perhaps" , "one of a band" , "It's the valve operator" , "Musician" .)