Very enthusiastic joke answer (4)

I believe the answer is:

gaga

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'very enthusiastic' is the definition.
'gaga' can be an answer for 'enthusiastic' (thesaurus). I'm unsure of the 'very' bit.

'joke answer' is the wordplay.
'joke' becomes 'gag' (a gag is a joke or witticism).
'answer' becomes 'a' (abbreviation eg in Q and A).
'gag'+'a'='GAGA'

Can you help me to learn more?

(Other definitions for gaga that I've seen before include "bananas" , "Lady who sings" , "Somewhat demented" , "Slang for crazy - apply a gag" , "fatuous?" .)

I've seen this clue in The Daily Express.

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