Crossword Genius

Turns out lutenist Martin’s one of the musical group (15)

Ross

I believe the answer is:

instrumentalist

I'm a little stuck... Click here to teach me more about this clue!

'one of the musical group' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'turns out lutenist martin's' is the wordplay.
'turns out' indicates anagramming the letters.
'lutenist'+'martins'='lutenistmartins'
'lutenistmartins' is an anagram of 'INSTRUMENTALIST'.

Can you help me to learn more?

(Other definitions for instrumentalist that I've seen before include "musician" , "oboe, perhaps" , "one of the band" .)

I've seen this clue in the Sydney Morning Herald.
Want a hint initially instead of a full solution? Install my app