Manage to enclose second area with trees (5)
I believe the answer is:
copse
'trees' is the definition.
(a copse is a small wood)
'manage to enclose second' is the wordplay.
'manage' becomes 'cope' (manage can mean to cope or do well).
'to enclose' indicates putting letters inside.
'second' becomes 's' (common abbreviation).
'cope' placed around 's' is 'COPSE'.
'area with' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for copse that I've seen before include "Stand of trees" , "Scope for a small wood" , "Piece of managed woodland" , "Dense growth of shrubs or trees" , "Small thicket" .)