Worked out temperature came down (7)
I believe the answer is:
trained
'worked out' is the definition.
(training is a kind of working out)
'temperature came down' is the wordplay.
'temperature' becomes 't' (abbreviation).
'came down' becomes 'rained' (raining is a kind of coming down).
't'+'rained'='TRAINED'
(Other definitions for trained that I've seen before include "Worked out" , "I daren't (anag)" , "Coached" , "Did exercises" , "Schooled" .)