Having caught and got its teeth into the robber (6)
I believe the answer is:
bandit
'the robber' is the definition.
(I've seen this before)
'having caught and got' is the wordplay.
'having caught' means one lot of letters goes inside another.
'got' becomes 'bit' (I am not sure about this - if you are sure you should believe this answer much more).
'and' placed into 'bit' is 'BANDIT'.
'its teeth into' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for bandit that I've seen before include "Violent robber" , "Outlawed robber" , "Outlaw, brigand" , "Violent outlaw" , "Thief" .)