Examination including piano, in part (10)
I believe the answer is:
inspection
'examination' is the definition.
(I know that inspection is a type of examination)
'including piano in part' is the wordplay.
'including' indicates putting letters inside.
'piano' becomes 'p' (musical abbreviation).
'part' becomes 'section' (synonyms).
'in'+'section'='insection'
'p' put within 'insection' is 'INSPECTION'.
(Other definitions for inspection that I've seen before include "Official examination" , "perusal" , "Check" , "Close examination" .)