Huge band performance covers a stunt (8)

I believe the answer is:

gigantic

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'huge' is the definition.
(synonyms)

'band performance covers a stunt' is the wordplay.
'band performance' becomes 'gig' (I've seen this before).
'covers a stunt' becomes 'antic' (I can't explain this - if you can you should believe this answer much more).
'gig'+'antic'='GIGANTIC'

Can you help me to learn more?

(Other definitions for gigantic that I've seen before include "Of very great size" , "Huge, enormous" , "Hugh,colossal" , "monster" , "Extremely large" .)

I've seen this clue in the Sydney Morning Herald.

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