Recover, say, during wet weather (6)
I believe the answer is:
regain
'recover' is the definition.
('regain' can be a synonym of 'recover')
'say during wet weather' is the wordplay.
'say' becomes 'eg'.
'during' indicates putting letters inside.
'wet weather' becomes 'rain' (I've seen this before).
'eg' going inside 'rain' is 'REGAIN'.
(Other definitions for regain that I've seen before include "Take back (the Ashes, for example)" , "Recover, retrieve" , "Possess once more for regina" , "Get back (previously owned object)" , "Win back" .)