Crossword Genius

Wag is huge, not small (5)

Ross

I believe the answer is:

comic

'wag' is the definition.
(wag can mean a comical person)

'huge not small' is the wordplay.
'huge' becomes 'cosmic' (on a cosmic scale).
'not' is a deletion indicator.
'small' becomes 's' (abbreviation - e.g. clothes size).
'cosmic' with 's' removed is 'COMIC'.

'is' acts as a link.

(Other definitions for comic that I've seen before include "Children's periodical" , "Funny, laughable" , "Raising mirth" , "Professional joke-teller" , "Funny, droll" .)

I've seen this clue in The Guardian.
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