Recover, for instance, in wet weather (6)
I believe the answer is:
regain
'recover' is the definition.
(synonyms)
'for instance in wet weather' is the wordplay.
'for instance' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'in' means one lot of letters goes inside another.
'wet weather' becomes 'rain' (rain is wet weather).
'eg' inserted inside '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" .)