Reticent about trees (5)
I believe the answer is:
terse
'reticent' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?
'about trees' is the wordplay.
'about' indicates an anagram.
'trees' is an anagram of 'TERSE'.
Can you help me to learn more?
(Other definitions for terse that I've seen before include "Sparing with words; abrupt" , "Curt, concise" , "Brusque and curt" , "Sententious" , "Reset to be pithy" .)