A conifer ultimately carried aroma resembling a tree (11)
I believe the answer is:
arborescent
'resembling a tree' is the definition.
(arborescent means resembling or like a tree)
'a conifer ultimately carried aroma' is the wordplay.
'a conifer ultimately' becomes 'ar' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'carried' becomes 'bore' (I've seen this before).
'aroma' becomes 'scent' (synonyms).
'ar'+'bore'+'scent'='ARBORESCENT'
(Other definitions for arborescent that I've seen before include "Like plane maybe" , "having characteristics of 17 [TREE]" .)