Need month off, as recovering (2,3,4)
I believe the answer is:
on the mend
'recovering' is the definition.
(I've seen this before)
'need month off' is the wordplay.
'off' indicates anagramming the letters.
'need'+'month'='needmonth'
'needmonth' is an anagram of 'ON THE MEND'.
'as' acts as a link.
(Other definitions for on the mend that I've seen before include "convalescing" , "returning to health" , "undergoing recovery?" , "Becoming better in health" , "Looking up" .)