Experienced unease as one dismantled fences (8)
I believe the answer is:
seasoned
'experienced' is the definition.
(similar in meaning)
'unease as one dismantled fences' is the wordplay.
'fences' indicates the answer is hidden within the clue (the solution is fenced in by the clue).
'SEASONED' is hidden in the letters of 'unease as one dismantled'.
(Other definitions for seasoned that I've seen before include "Flavoured or hardened" , "Aged" , "Gave experience to" , "Of food, flavoured with salt, pepper etc" , "added salt" .)