Crossword Genius

Worthless blunder set in stone (8)

Ross

I believe the answer is:

rubbishy

'worthless' is the definition.
('rubbishy' can be similar in meaning to 'worthless')

'blunder set in stone' is the wordplay.
'blunder' becomes 'bish' (I've seen this before).
'set in' indicates putting letters inside.
'stone' becomes 'ruby' (I've seen this before).
'bish' inserted inside '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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