Various men are trained for the sea (13)
I believe the answer is:
mediterranean
'the sea' is the definition.
(Mediterranean is an example)
'various men are trained' is the wordplay.
'various' indicates anagramming the letters.
'men'+'are'+'trained'='menaretrained'
'menaretrained' with letters rearranged gives 'MEDITERRANEAN'.
'for' is the link.
(Other definitions for mediterranean that I've seen before include "Sea south of Europe" , "Inland sea" , "Sea north of Africa" , "Sea linking three continents" .)