Regularly train to obtain bronze (3)
I believe the answer is:
tan
'bronze' is the definition.
(both can mean to get a sun tan)
'regularly train' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternate letters of 'train' are 'TAN'.
'to obtain' is the link.
(Other definitions for tan that I've seen before include "Nice brown induced by sun" , "Brown to beat" , "Shade of brown" , "Reddish-brown" , "Beat the colour" .)