Again deal with study before shift
I believe the answer is:
readdress
'again deal with' is the definition.
('address' can be a synonym for 'deal with' so perhaps 'readdress' is OK for 'again deal with')
'study before shift' is the wordplay.
'study' becomes 'read' ('read' can be a synonym of 'study').
'before' is a charade indicator (letters next to each other).
'shift' becomes 'dress' (I've seen this before**).
'read'+'dress'='READDRESS'
(Other definitions for readdress that I've seen before include "forward" , "Have another look at" , "tackle again" , "change direction" .)