Take a rest, possibly being idle now (3,4)
I believe the answer is:
lie down
'take a rest' is the definition.
(I've seen this before)
'being idle now' is the wordplay.
'idle now' can be anagrammed to 'LIE DOWN'.
Though, I'm not sure how this is indicated.
'possibly' acts as a link.
Can you help me to learn more?
(Other definitions for lie down that I've seen before include "Recline" , "Take rest; be submissive (under)" , "Enid Low (anag.)" , "Short rest on a bed" , "Assume a reclining position" .)