Stole pig that has no tail (3)
I believe the answer is:
boa
'stole' is the definition.
(I've seen this before)
'pig that has no tail' is the wordplay.
'pig' becomes 'boar' (I've seen this before).
'that has no tail' means to remove the last letter.
'boar' with its last letter taken off is 'BOA'.
(Other definitions for boa that I've seen before include "Potential killer" , "that's dangerous for South Americans" , "... cold-blooded creature" , "Long, thin, feathery scarf" , "Large constricting snake" .)