Celebrity turning up in a tree, possibly (6)
I believe the answer is:
repute
'celebrity' is the definition.
(I've seen this before)
'turning up in a tree possibly' is the wordplay.
'turning' is a reversal indicator.
'in' indicates putting letters inside.
'possibly' indicates an anagram.
'up' reversed gives 'pu'.
'tree' with letters rearranged gives 'rete'.
'pu' going into 'rete' is 'REPUTE'.
(Other definitions for repute that I've seen before include "State of high esteem" , "Character, esteem" , "Generally held opinion" , "General view or opinion of an individual, may be ill" , "Known character, standing" .)