All things considered, you need rest after working (2,7)
I believe the answer is:
on balance
'all things considered' is the definition.
(thesaurus)
'rest after working' is the wordplay.
'rest' becomes 'balance' (I've seen this before**).
'after' means one lot of letters go next to another.
'working' becomes 'on'.
'balance' put after 'on' is 'ON BALANCE'.
'you need' acts as a link.
(Other definitions for on balance that I've seen before include "Having taken everything into consideration" , "Considering everything there is to know" , "All things considered, like lean bacon" , "After considering all factors involved" , "Taking everything into consideration - use scales" .)