Officer assisting general in plan that's crazy (6)
I believe the answer is:
madcap
'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" .)