UK wet weather — man's language (9)
I believe the answer is:
ukrainian
'language' is the definition.
(Ukrainian is an example)
'uk wet weather man's' is the wordplay.
'wet weather' becomes 'rain' (rain is wet weather).
'man' becomes 'ian' (man's name).
'uk'+'rain'+'ian'='UKRAINIAN'
(Other definitions for ukrainian that I've seen before include "from Chernobyl" , "Slav" , "foreigner" , "Little Russian" , "National" .)