The boy has a snowball, too (4)

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'too' is the definition.
(synonyms)

'the boy has a snowball' is the wordplay.
'the boy' becomes 'al'.
'has a snowball' becomes 'so' (I am not sure about this - if you are sure you should believe this answer much more).
'al'+'so'='ALSO'

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(Other definitions for also that I've seen before include "What's more" , "item's rarely used now for this" , "Additionally" , "in accompaniment" , "Likewise" .)

I've seen this clue in the Evening Standard.

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