Criminal gang has it (6)
I believe the answer is:
bandit
'criminal' is the definition.
(bandit is a kind of criminal)
'gang has it' is the wordplay.
'gang' becomes 'band' (I've seen this before).
'has' says to put letters next to each other.
'band'+'it'='BANDIT'
(Other definitions for bandit that I've seen before include "Member of a robber gang" , "Outlaw, brigand" , "(One-armed?) outlaw" , "hood" , "Dan bit the robber badly" .)