I am roaming around a twisted pine tree (8)
I believe the answer is:
magnolia
'tree' is the definition.
(magnolia is a kind of tree)
'i am roaming around a twisted pine' is the wordplay.
'roaming' indicates an anagram.
'around' indicates putting letters inside.
'twisted' shows that the letters should be reversed in order.
'pine' becomes 'long' (to pine for something is to long for it).
'long' in reverse letter order is 'gnol'.
'i'+'am'='iam'
'iam' is an anagram of 'mia'.
'a'+'gnol'='agnol'
'mia' placed around 'agnol' is 'MAGNOLIA'.
(Other definitions for magnolia that I've seen before include "Flowering tree; light pinkish white" , "Creamy-white colour" , "Fragrant bloom and popular paint colour" , "Spring-flowering tree" , "5" .)