Eraser used to trim edges of shrubbery (6)
I believe the answer is:
rubber
'eraser' is the definition.
(rubber is a kind of eraser)
'of shrubbery' is the wordplay.
'of' indicates the answer is hidden within the clue.
'RUBBER' is hidden in the letters of 'shrubbery'.
'used to trim edges' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for rubber that I've seen before include "tough polymeric material?" , "section of bridge" , "Something you get in bridge" , "Buffer" , "Elastic substance; set of bridge games" .)