Crossword Genius

Mistake wearing gem that's only cheap paste? (8)

Ross

I believe the answer is:

rubbishy

'that's only cheap paste?' is the definition.
I can't judge whether this defines the answer.

'mistake wearing gem' is the wordplay.
'mistake' becomes 'bish' (term for a blunder or mistake).
'wearing' indicates putting letters inside.
'gem' becomes 'ruby' (ruby is a kind of gem).
'bish' placed into 'ruby' is 'RUBBISHY'.

(Another definition for rubbishy that I've seen is " Poor-quality".)

I've seen this clue in The Times.
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