Clip it a different way, after Brussels trees (9)
I believe the answer is:
eucalypti
'trees' is the definition.
(eucalyptus is a kind of tree)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for eucalypti that I've seen before include "shrubs" , "Gums" , "Australian trees" , "Antipodean natives" , "Oil producers" .)