Concert, absurd performance, great (8)

I believe the answer is:

gigantic

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'great' is the definition.
(I've seen this before)

'concert absurd' is the wordplay.
'concert' becomes 'gig' (I've seen this in another clue).
'absurd' becomes 'antic' (I've seen this in another clue).
'gig'+'antic'='GIGANTIC'

'performance' is the link.
This may not be correct. It may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for gigantic that I've seen before include "'Enormous, mammoth (8)'" , "Sizeable" , "Exceedingly large" , "Stupendous" , "Extremely large" .)

I've seen this clue in The Sun.

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