Have a rest, being idle now anyhow (3,4)
I believe the answer is:
lie down
'have a rest' is the definition.
(I've seen this before)
'idle now anyhow' is the wordplay.
'anyhow' is an anagram indicator.
'idle'+'now'='idlenow'
'idlenow' with letters rearranged gives 'LIE-DOWN'.
'being' is the link.
(Other definitions for lie down that I've seen before include "Take rest; be submissive (under)" , "Now idle (anag) -- short rest" , "Take a rest (at length!)" , "Take to one's bed" , "Rest in a horizontal position" .)