Bilbo’s companion, displaying some tribal instincts (5)

I believe the answer is:

balin

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'bilbo's companion' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'displaying some tribal instincts' is the wordplay.
'displaying' says the answer is hidden in the clue.
'BALIN' can be found hidden inside 'some tribal instincts'.

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