I glance nervously like one on top of tree? (7)
I believe the answer is:
angelic
'one on top of tree?' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?
'i glance nervously' is the wordplay.
'nervously' indicates anagramming the letters.
'i'+'glance'='iglance'
'iglance' is an anagram of 'ANGELIC'.
'like' is the link.
Can you help me to learn more?
(Other definitions for angelic that I've seen before include "The host's" , "sweet-natured too" , "Like heavenly beings" , "I glance (anag.)" , "Saint-like" .)