Shout in Grantham (4)
I believe the answer is:
rant
'shout' is the definition.
(I've seen this in other clues)
'in grantham' is the wordplay.
'in' indicates the answer is hidden within the clue.
'RANT' is hidden within 'grantham'.
(Other definitions for rant that I've seen before include "Bombastically declaim" , "Wild speech" , "Talk wildly or violently" , "End-of-course exams" , "Speak wildly and incoherently" .)