Crossword Genius

Low temperature is debatable (4)

Ross

I believe the answer is:

moot

'debatable' is the definition.
('moot' can be a synonym of 'debatable')

'low temperature' is the wordplay.
'low' becomes 'moo' ('moo' can be a synonym of 'low').
'temperature' becomes 't' (abbreviation).
'moo'+'t'='MOOT'

'is' is the link.

(Other definitions for moot that I've seen before include "Open to argument or debate" , "Undecided as a debatable point may be" , "raise for discussion" , "Open to question" , "Such a point is arguable" .)

I've seen this clue in The Telegraph.
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