Dispute erupting finally in a French street (5)
I believe the answer is:
argue
'dispute' is the definition.
(thesaurus)
'erupting finally in a french street' is the wordplay.
'finally' says to take the final letters.
'in' indicates putting letters inside.
'french street' becomes 'rue' (French for street or road).
The last letter of 'erupting' is 'g'.
'a'+'rue'='arue'
'g' placed into 'arue' is 'ARGUE'.
(Other definitions for argue that I've seen before include "Present the case for" , "contradict" , "Make a case" , "Dispute, disagree" , "Quarrel or disagree" .)