Joke answer is very enthusiastic (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 not sure about 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'

'is' is the link.

Can you help me to learn more?

(Other definitions for gaga that I've seen before include "Slangily crazy, off one's head" , "Slang for crazy - apply a gag" , "bananas" , "Barmy joke, third in cracker" , "Slangily and repetitively crazy" .)

I've seen this clue in The Daily Express.

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