Material used for some garden implements (5)
I believe the answer is:
denim
'material' is the definition.
(type of fabric)
'used for some garden implements' is the wordplay.
'used for' says the answer is hidden in the clue.
'DENIM' can be found hidden inside 'some garden implements'.
(Other definitions for denim that I've seen before include "Durable material" , "Hard-wearing clothing material, twilled cotton" , "Fabric used for jeans" , "Coarse durable twill-weave cotton fabric" , "Twilled cotton fabric" .)