King having holiday aboard cutter (7)
I believe the answer is:
cleaver
'cutter' is the definition.
(I know that cleaver is a type of knife)
'king having holiday aboard' is the wordplay.
'king' becomes 'CR' (short for Carolus Rex, King Charles in Latin).
'having' means one lot of letters goes inside another.
'holiday aboard' becomes 'leave' (I've seen this before. I am not sure about the 'aboard' bit.).
'cr' placed around 'leave' is 'CLEAVER'.
Can you help me to learn more?
(Other definitions for cleaver that I've seen before include "Meat axe" , "Hatchet for chopping meat" , "A butcher's chopping tool" , "Long-bladed hatchet" , "(Meat) chopper" .)