Tea’s temperature affected flavour (5)
I believe the answer is:
taste
'flavour' is the definition.
(I've seen this before)
'tea's temperature affected' is the wordplay.
'temperature' becomes 't' (abbreviation).
'affected' indicates an anagram.
'teas'+'t'='teast'
'teast' is an anagram of 'TASTE'.
(Other definitions for taste that I've seen before include "Sample - discrimination" , "Perceive the flavour" , "Sample the flavour" , "Sensation in the mouth caused by food" , "A sense; briefly sample" .)