Modified an obsolete piano brought in (7)
I believe the answer is:
adapted
'modified' is the definition.
(similar in meaning)
'an obsolete piano brought in' is the wordplay.
'an' becomes 'a'.
'obsolete' becomes 'dated' (I've seen this before).
'piano' becomes 'p' (musical abbreviation).
'brought in' is an insertion indicator.
'dated' going around 'p' is 'dapted'.
'a'+'dapted'='ADAPTED'
(Other definitions for adapted that I've seen before include "Modified to suit" , "Made suitable for new purpose" , "Date-pad (anag.)" , "Altered" , "accommodated" .)