Spoil lines of squashes (7)

I believe the answer is:

marrows

'squashes' is the definition.
(marrow is a kind of squash)

'spoil lines' is the wordplay.
'spoil' becomes 'mar' (synonyms).
'lines' becomes 'rows' (row is a kind of line).
'mar'+'rows'='MARROWS'

'of' acts as a link.

(Another definition for marrows that I've seen is " Vegetables".)

I've seen this clue in the Sydney Morning Herald.

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