Crossword Genius

Officer assisting general in plan that's crazy (6)

Ross

I believe the answer is:

madcap

I'm a little stuck... Click here to teach me more about this clue!

'that's crazy' is the definition.
(I've seen this before)

'officer assisting general in plan' is the wordplay.
I cannot really see how this works, but
'officer' could be 'cap' and 'cap' is found in the answer.
The remaining letters 'mad' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for madcap that I've seen before include "Lively" , "terror" , "Eccentric or reckless person" , "Foolish, reckless" , "Reckless girl" .)

I've seen this clue in The Globe and Mail.
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