Feverish winter weeks are annoying (7)
I believe the answer is:
febrile
'feverish' is the definition.
(I know that feverish can be written as febrile)
'winter weeks are annoying' is the wordplay.
'winter weeks' becomes 'feb' (I can't justify this - if you can you should believe this answer much more).
'are annoying' becomes 'rile' (to rile someone is to annoy them).
'feb'+'rile'='FEBRILE'
Can you help me to learn more?
(Other definitions for febrile that I've seen before include "Overheated" , "Of or involving a fever, feverish" , "Very hot" , "Delirious" , "Showing nervous excitement" .)