Short arrangement of trees (5)
I believe the answer is:
terse
'short' is the definition.
(synonyms)
'arrangement of trees' is the wordplay.
'arrangement of' is an anagram indicator.
'trees' with letters rearranged gives 'TERSE'.
(Other definitions for terse that I've seen before include "Brusque among trees" , "Curt, concise" , "Abrupt, concise" , "Of speech, short and pithy" , "Crisply brief" .)