Crossword Genius

Sort out a profit -- one grand, possibly (10)

Ross

I believe the answer is:

'grand possibly' is the definition.
(grand is a kind of pianoforte)

'sort out a profit one' is the wordplay.
'sort out' indicates anagramming the letters.
'a'+'profit'+'one'='aprofitone'
'aprofitone' is an anagram of 'PIANOFORTE'.

(Other definitions for pianoforte that I've seen before include "Joanna", "Keyboard instrument", "might be grand".)

I've seen this clue in The Telegraph.