Crossword Genius

Bully to use tribal form (9)

Ross

I believe the answer is:

brutalise

I'm a little stuck... Click here to teach me more about this clue!

'form' is the definition.
The definition and answer can be both related to change as well as being verbs in their base form.
Perhaps there's a link between them I don't understand?

'bully to use tribal' is the wordplay.
'bully' indicates an anagram (I've seen this in other clues).
'use'+'tribal'='usetribal'
'usetribal' anagrammed gives 'BRUTALISE'.

Can you help me to learn more?

(Another definition for brutalise that I've seen is " Make bestial".)

I've seen this clue in The Mirror.
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