A prize for waste (7)

I believe the answer is:

atrophy

'for waste' is the definition.
(atrophy means to waste away)

'a prize' is the wordplay.
'prize' becomes 'trophy' (synonyms).
'a'+'trophy'='ATROPHY'

(Other definitions for atrophy that I've seen before include "shrivel" , "Decay" , "Degenerate" , "wasting away" , "Become weak and thin through lack of use or nourishment" .)

I've seen this clue in The Guardian, The Irish News and The Globe and Mail.

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