Agree; get on well with (3,2,3)

I believe the answer is:

hit it off

(Other definitions for hit it off that I've seen before include "Become immediate friends" , "Get on well - with a blow?" , "Agree - get on well together" , "Become compatible and friendly" , "Get on well with - or knock from position?" .)

I've seen this clue in The Guardian.

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