Crossword Genius

Tremendous performance opposed by Conservative (8)

Ross

I believe the answer is:

gigantic

'tremendous' is the definition.
(synonyms)

'performance opposed by conservative' is the wordplay.
'performance' becomes 'gig' (a gig is a musical concert).
'opposed' becomes 'anti' (similar in meaning).
'by' is a charade indicator (letters next to each other).
'conservative' becomes 'C' (UK political abbreviation).
'gig'+'anti'+'c'='GIGANTIC'

(Other definitions for gigantic that I've seen before include "Titanic" , "monster" , "walloping" , "Exceedingly large" , "Huge, enormous" .)

I've seen this clue in The Times.
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