Want to lie in grass, taking it easy (8)
I believe the answer is:
slacking
'want to lie' is the definition.
I can't tell whether this definition defines the answer.
'in grass taking it easy' is the wordplay.
'in' means one lot of letters goes inside another.
'grass' becomes 'sing' (both can mean to act as an informant).
'taking it easy' becomes 'lack' (I can't explain this - if you can you should give a lot more credence to this answer).
'sing' enclosing 'lack' is 'SLACKING'.
Can you help me to learn more?
(Another definition for slacking that I've seen is " Slick nag (anag.)".)