Regularly seen around in Dunnet Forest (5)
I believe the answer is:
often
'regularly' is the definition.
(often means regularly or frequently)
'around in dunnet forest' is the wordplay.
'around' is a reversal indicator.
'in' indicates a hidden word.
'netfo' is hidden in the letters of 'dunnet forest'.
'netfo' back-to-front is 'OFTEN'.
'seen' is the link.
(Other definitions for often that I've seen before include "Turn away" , "Frequently, not seldom" , "Quite frequently" , "Repeatedly with regularity" , "Frequently, many times" .)