One playing instrument made from old French wood — tango? (6)
I believe the answer is:
'one playing instrument' is the definition.
(I know that oboist is a type of instrumentalist)
'old french wood tango?' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'french wood' becomes 'bois' ('wood' in French).
'tango?' becomes 'T' (phonetic alphabet: alpha, bravo, charlie etc.).
'made from' acts as a link.
(Other definitions for oboist that I've seen before include "Musician who plays woodwind of treble pitch" , "Do I boost the musician?" , "Player of woodwind instrument of treble pitch" , "Wind player" , "Instrumentalist" .)