Intentionally lose argument, following temperature getting hot (5)
I believe the answer is:
throw
'intentionally lose' is the definition.
(I've seen this in another clue)
'argument following temperature getting hot' is the wordplay.
'argument' becomes 'row' (to row is to argue).
'following' means one lot of letters go next to another.
'temperature' becomes 't' (abbreviation).
'getting' means one lot of letters go next to another.
'hot' becomes 'h' (abbreviation eg on taps).
't'+'h'='th'
'row' put after 'th' is 'THROW'.
(Other definitions for throw that I've seen before include "Light rug" , "Toss" , "Cast, lob" , "Form (pot) on a wheel" , "Hurl; perplex" .)