Vessel in which a nut gets cracked (3)
I believe the answer is:
tun
'vessel' is the definition.
(tun is a kind of vessel)
'which a nut gets cracked' is the wordplay.
'nut' can be anagrammed to 'TUN'.
Though, I'm unsure how this is indicated.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for tun that I've seen before include "Container of beer" , "Large cask for wine or beer" , "Nut found in large cask" , "vessel" , "beer barrel" .)