Temperature within an office adjusted for warmth (9)
I believe the answer is:
affection
'for warmth' is the definition.
(thesaurus)
'temperature within an office adjusted' is the wordplay.
'temperature' becomes 't' (abbreviation).
'within' indicates putting letters inside.
'adjusted' indicates anagramming the letters.
'an'+'office'='anoffice'
'anoffice' anagrammed gives 'affecion'.
't' inserted into 'affecion' is 'AFFECTION'.
(Other definitions for affection that I've seen before include "Feeling of love or strong liking" , "Goodwill" , "Fondness or liking" , "Feeling of fondness" , "Fond attachment" .)