Cap pike cultivation (4)
I believe the answer is:
kepi
'cap' is the definition.
(I know that kepi is a type of cap)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for kepi that I've seen before include "French military hat" , "Service cap" , "Flat-topped military cap" , "French military cap" , "French army cap" .)