Team up to restrict temperature changes (5)
I believe the answer is:
edits
'changes' is the definition.
(editing is a kind of changing)
'team up to restrict temperature' is the wordplay.
'team' becomes 'side' (both can mean a sports team).
'up' is a reversal indicator (in down clue: letters go upwards).
'to restrict' is an insertion indicator (inserted letters are restricted or trapped).
'temperature' becomes 't' (abbreviation).
'side' in reverse letter order is 'edis'.
'edis' placed around 't' is 'EDITS'.
(Other definitions for edits that I've seen before include "Checks" , "Alters (text)" , "Modifies" , "Tides (anag.)" , "Revises" .)