Dispute low temperature (4)
I believe the answer is:
moot
'dispute' is the definition.
(thesaurus)
'low temperature' is the wordplay.
'low' becomes 'moo' ('moo' can be a synonym of 'low').
'temperature' becomes 't' (abbreviation).
'moo'+'t'='MOOT'
(Other definitions for moot that I've seen before include "Subject to dispute" , "Open to argument or debate" , "Such a point is disputable" , "Open to question" , "Controversial" .)