Leads off to glens (5)
I believe the answer is:
dales
'glens' is the definition.
(I've seen this in another clue)
'leads off' is the wordplay.
'off' indicates anagramming the letters.
'leads' anagrammed gives 'DALES'.
'to' is the link.
(Other definitions for dales that I've seen before include "Leads into poetic valleys" , "Yorkshire valleys" , "(North England) valleys" , "Open river valleys in hilly areas" .)