Outlaw, we hear, is not allowed it (6)
I believe the answer is:
bandit
'outlaw' is the definition.
(I've seen this before)
'we hear is not allowed it' is the wordplay.
'we hear' indicates a 'sounds like' (homophone) clue.
'is not allowed' becomes 'banned'.
'banned' is a homophone of 'band'.
'band'+'it'='BANDIT'
(Other definitions for bandit that I've seen before include "Dan bit the robber badly" , "Outlaw, robber" , "Thief" , "(One-armed?) outlaw" , "Violent robber" .)