Fight eruption ends in front of bar (9)
I believe the answer is:
encounter
'fight' is the definition.
(encounter is a kind of fight)
'eruption ends in front of bar' is the wordplay.
'ends' means to remove the middle letters.
'in front of' is a charade indicator (letters next to each other).
'bar' becomes 'counter' (I've seen this before**).
'eruption' with its middle taken out is 'en'.
'en'+'counter'='ENCOUNTER'
(Other definitions for encounter that I've seen before include "tackle" , "Meet by chance or enexpectedly" , "Meet by chance with encore nut" , "Meet, come across" , "Come upon, meet" .)