Rushed out of Grantham (3)
I believe the answer is:
ran
'rushed' is the definition.
'out of grantham' is the wordplay.
'out of' indicates a hidden word.
'RAN' is hidden in the letters of 'grantham'.
(Other definitions for ran that I've seen before include "Operated; hurried" , "Administered" , "Moved fast or managed" , "Entered an election or managed" , "Stood for election or managed" .)