Crossword Genius

Grand cooker? That's mad! (4)


I believe the answer is:


'mad' is the definition.

'grand cooker?' is the wordplay.
'grand' becomes 'g' (G is short for grand as in a thousand).
'cooker?' becomes 'aga' (I've seen this before).

'that's' acts as a link.

(Other definitions for gaga that I've seen before include "In repetitive slang, senile or crazy" , "US singer Lady ___" , "In senile dotage" , "Queen's radio recording" , "crackers" .)

I've seen this clue in The Telegraph.
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