But roamer may get confused in this tree garden (9)
I believe the answer is:
arboretum
'this tree garden' is the definition.
(I've seen this before)
'but roamer may get confused' is the wordplay.
'but roamer' can be anagrammed to 'ARBORETUM'.
Though, I'm unsure how this is indicated.
'in' is the link.
Can you help me to learn more?
(Other definitions for arboretum that I've seen before include "area with great growth" , "Botanical garden of trees" , "Collection of elders, say" , "Botanical tree garden" , "Botanic garden of trees" .)