The chap on piano was 'with it' (3)
I believe the answer is:
hep
'with it' is the definition.
(old-fashioned spelling of 'hip', meaning trendy)
'the chap on piano' is the wordplay.
'the chap' becomes 'he' ().
'on' is a charade indicator (letters next to each other).
'piano' becomes 'p' (musical abbreviation).
'he'+'p'='HEP'
'was' is the link.
(Another definition for hep that I've seen is " Knowing (jazz slang); rhymes with dance move".)
I've seen this clue in the Evening Standard.
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