Dispute among popular guests (5)
I believe the answer is:
argue
'dispute' is the definition.
(to argue something is to dispute or contest it)
'among popular guests' is the wordplay.
'among' indicates the answer is hidden within the clue.
'ARGUE' is hidden within 'popular guests'.
(Other definitions for argue that I've seen before include "Contest verbally, dispute" , "Debate, row" , "Reason" , "Have a difference of opinion" , "Dispute - debate" .)