Spoil part of a summary (3)

I believe the answer is:

mar

'spoil' is the definition.
(synonyms)

'part of a summary' is the wordplay.
'part of' indicates a hidden word.
'MAR' is hidden within 'summary'.

(Other definitions for mar that I've seen before include "A windy month" , "Spanish main?" , "Cause harm" , "'Impair, spoil (3)'" , "Spoil or deface" .)

I've seen this clue in The Globe and Mail.

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