Make bears, maybe, behave like hawks? (5-6)

I believe the answer is:

sabre-rattle

'behave like hawks?' is the definition.
(a hawk is someone favouring military action)

'make bears maybe' is the wordplay.
'make' indicates anagramming the letters.
'maybe' becomes 'rattle' (I can't justify this - if you can you should give a lot more credence to this answer).
'bears' with letters rearranged gives 'sabre'.
'sabre'+'rattle'='SABRE-RATTLE'

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.