Need month off 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' anagrammed gives 'ON THE MEND'.
(Other definitions for on the mend that I've seen before include "Informally getting better, improving after illness or accident" , "Looking up" , "Improving in health" , "undergoing recovery?" , "Recovering from an injury or illness" .)