Recover, for instance, in wet weather (6)
I believe the answer is:
regain
'recover' is the definition.
('regain' can be a synonym of 'recover')
'for instance in wet weather' is the wordplay.
'for instance' becomes 'eg' ('e.g.' can be a synonym of 'for instance').
'in' means one lot of letters goes inside another.
'wet weather' becomes 'rain' (I've seen this before).
'eg' placed within 'rain' is 'REGAIN'.
(Other definitions for regain that I've seen before include "Recover - in gear (anag)" , "Win back" , "Possess once more for regina" , "Take back (the Ashes, for example)" , "Get back, recover the use of" .)