Resort temperature causes an argument (4)
I believe the answer is:
spat
'an argument' is the definition.
(thesaurus)
'resort temperature' is the wordplay.
'resort' becomes 'spa' (spa is a kind of resort).
'temperature' becomes 't' (abbreviation).
'spa'+'t'='SPAT'
'causes' is the link.
(Other definitions for spat that I've seen before include "Petty quarrel or fight" , "angry words" , "Disagreement" , "A small tiff or quarrel" , "Little quarrel - leg wear" .)