Catalogue space with hesitation, moving a tree (9)
I believe the answer is:
enumerate
'catalogue' is the definition.
Although both the answer and definition are verbs in their base form, I can't see how one could define the other.
'space with hesitation moving a tree' is the wordplay.
'space' becomes 'en' (in printing, a space as wide as a letter 'n').
'with' is a charade indicator (letters next to each other).
'hesitation' becomes 'um' (sound made when hesitating).
'moving' is an anagram indicator (letters are moved around).
'a'+'tree'='atree'
'atree' is an anagram of 'erate'.
'en'+'um'+'erate'='ENUMERATE'
Can you help me to learn more?
(Other definitions for enumerate that I've seen before include "List one by one" , "Count or mention items one by one" , "Count - list" , "Specify individually" .)