Expert having to conceal a butchery tool (7)
I believe the answer is:
cleaver
'tool' is the definition.
(cleaver is a kind of tool)
'expert having to conceal a butchery' is the wordplay.
I cannot quite understand how this works, but
'a' is present in the answer.
'expert' could be 'clever' (I've seen this before) and 'clever' is located in the leftover letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for cleaver that I've seen before include "Meat axe" , "dangerous object?" , "A butcher may use it" , "Hatchet for chopping meat" , "Butcher's chopper" .)