Idiot half-cut lodger attacking one? (6)
I believe the answer is:
mugger
'attacking one?' is the definition.
(somebody who attacks people to rob them)
'idiot half-cut lodger' is the wordplay.
'idiot' becomes 'mug' (I've seen this before).
'half cut' indicates taking half.
'lodger' with half the letters taken is 'ger'.
'mug'+'ger'='MUGGER'
(Other definitions for mugger that I've seen before include "A street attacker-robber" , "Type of 1 - thug" , "Street robber" , "Violent robber - crocodile" , "Criminal - crocodile" .)