Aeroplane manoeuvre not entirely crazy (4)
I believe the answer is:
loop
'aeroplane manoeuvre' is the definition.
'loop' can be an answer for 'manoeuvre' (I have seen 'Aerobatic manoeuvre ' mean 'loop' so perhaps 'manoeuvre' could also mean 'loop'). I'm unsure of the 'aeroplane' bit.
'not entirely crazy' is the wordplay.
'not entirely' means to remove the last letter (not all of the word).
'crazy' becomes 'loopy' (I've seen this in another clue).
'loopy' with its last letter taken off is 'LOOP'.
Can you help me to learn more?
(Other definitions for loop that I've seen before include "the knowledgeable are in it" , "Shape formed by a closed curve that does not intersect itself" , "(Of aircraft) make a circle vertically" , "Oval shape" , "Aerobatic manoeuvre" .)