Sly individual leaving stand (5)
I believe the answer is:
stall
'stand' is the definition.
('stall' can be a synonym of 'stand')
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for stall that I've seen before include "Cowshed or stable" , "Animal compartment" , "Postpone what one should be doing" , "(Of engine) stop running; booth" , "Block" .)