Called Gran over (4)
I believe the answer is:
rang
'called' is the definition.
('ring' can be a synonym of 'call')
'gran over' is the wordplay.
'over' indicates anagramming the letters.
'gran' is an anagram of 'RANG'.
(Other definitions for rang that I've seen before include "Made a phone call" , "(Of bell) sounded" , "Called" , "Phoned; did resound" , "Made tolling sound or phoned" .)