Share son's piano books (5)

I believe the answer is:

split

'share' is the definition.
(split can mean someone's share of something)

'son's piano books' is the wordplay.
'piano' becomes 'p' (musical abbreviation).
'books' becomes 'lit' (abbreviation for literature).
's'+'p'+'lit'='SPLIT'

(Other definitions for split that I've seen before include "Mediterranean port" , "shop" , "Rent" , "Cleave or divide" , "Divided" .)

I've seen this clue in The Guardian.

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