Very good stars showing blemishes (7)

I believe the answer is:

defaces

'blemishes' is the definition.
('deface' can be a synonym of 'blemish')

'very good stars' is the wordplay.
'very good' becomes 'def' (def can informally mean excellent).
'stars' becomes 'aces' ('ace' can be a synonym of 'star').
'def'+'aces'='DEFACES'

'showing' acts as a link.

I've seen this clue in The Guardian.

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