Grass up old lag, getting time inside as such? (10)
I believe the answer is:
shoplifter
'time inside as such?' is the definition.
I can't tell whether this definition defines the answer.
'grass up old lag' is the wordplay.
'grass' becomes 'shop' (I've seen this before).
'up old lag' becomes 'lifter' (I can't explain this - if you can you should give a lot more credence to this answer).
'shop'+'lifter'='SHOPLIFTER'
'getting' is the link.
Can you help me to learn more?
(Other definitions for shoplifter that I've seen before include "guilty party" , "Thieving customer" , "A petty criminal" , "Criminal (in a retail context)" , "Robber" .)