Star guest taking part in quarrel (5)
I believe the answer is:
argue
'quarrel' is the definition.
(I've seen this before)
'star guest taking part' is the wordplay.
'taking part' says the answer is hidden in the clue.
'ARGUE' can be found hidden inside 'star guest'.
'in' is the link.
(Other definitions for argue that I've seen before include "Discuss, contend" , "Quarrel or disagree" , "Heatedly exchange views" , "Debate, row" , "Present reasons for or against" .)