Desire a bit of sunshine in most of the days of November (6)
I believe the answer is:
thirst
'desire' is the definition.
(thirsting is a kind of desiring)
'a bit of sunshine in most of the days of november' is the wordplay.
'a bit of' indicates taking the first letters.
'in' means one lot of letters goes inside another.
'most of' means to remove the last letter.
'the days of november' becomes 'thirty' (month with 30 days).
The first letter of 'sunshine' is 's'.
'thirty' with its last letter taken away is 'thirt'.
's' going within 'thirt' is 'THIRST'.
(Other definitions for thirst that I've seen before include "The inducement for 5 Down" , "A need (for liquid)" , "A craving for drink or knowledge" , "lack of water" , "Strong desire for drink" .)