A giant highly excited (4)

I believe the answer is:

agog

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

'a giant' is the wordplay.
'giant' becomes 'gog' (I've seen this before).
'a'+'gog'='AGOG'

(Other definitions for agog that I've seen before include "Excitedly interested" , "Expectant and wide-eyed" , "In excited eagerness" , "Eagerly awaiting" , "Eager and wide-eyed" .)

I've seen this clue in The Telegraph.

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