Phone in bar over to rear (5,2)
I believe the answer is:
bring up
'rear' is the definition.
(I know that rear can be written as bring up)
'phone in bar over' is the wordplay.
'phone' becomes 'ring' (to ring on the phone).
'in' indicates putting letters inside.
'bar' becomes 'pub' (I've seen this in another clue).
'over' is a reversal indicator.
'pub' written backwards gives 'bup'.
'ring' going within 'bup' is 'BRING UP'.
'to' is the link.
(Other definitions for bring up that I've seen before include "Rear like child, or mention for discussion" , "train" , "Lively Baroque dance" , "Rear, or raise for discussion" , "Raise (topic)" .)