Commotion arising in Amritsar (4)
I believe the answer is:
stir
'commotion' is the definition.
(stir can mean a commotion)
'arising in amritsar' is the wordplay.
'arising' says the letters should be written in reverse.
'in' indicates the answer is hidden within the clue.
'rits' is hidden within 'amritsar'.
'rits' written backwards gives 'STIR'.
(Other definitions for stir that I've seen before include "Affect emotionally" , "Whisk or rouse" , "Whisk or whip" , "Move around and mix thoroughly" , "Commotion - prison" .)