Capital extremely tense after cold weather (7)
I believe the answer is:
climate
'weather' is the definition.
(thesaurus)
'capital extremely tense after cold' is the wordplay.
'capital' becomes 'lima' (Lima is an example**).
'extremely' means to remove the middle letters.
'after' says to put letters next to each other.
'cold' becomes 'c' (eg on taps).
'tense' with its centre removed is 'te'.
'lima'+'te'='limate'
'limate' after 'c' is 'CLIMATE'.
(Other definitions for climate that I've seen before include "Cite Mal (anag.)" , "Atmosphere" , "Weather etc" , "Mail, etc (anag.)" , "Prevailing weather conditions" .)