Suburb lad easily conceals knife (5)
I believe the answer is:
blade
'knife' is the definition.
(type of blade)
'suburb lad easily conceals' is the wordplay.
'conceals' indicates the answer is hidden within the clue.
'BLADE' is hidden in the letters of 'suburb lad easily'.
(Other definitions for blade that I've seen before include "Flat part of an oar" , "Leaf, of grass, say" , "Cutting part of grass?" , "A knife, or a dashing fellow" , "Sword" .)