Slight colouring from drinking bout — new start needed! (5)
I believe the answer is:
tinge
'slight colouring' is the definition.
(I've seen this before)
'drinking bout new start needed' is the wordplay.
'drinking bout' becomes 'tige' (I am not sure about this - if you are sure you should believe this answer much more).
'start' indicates taking the first letters.
'needed' is an insertion indicator.
The first letter of 'new' is 'n'.
'tige' placed around 'n' is 'TINGE'.
'from' acts as a link.
(Other definitions for tinge that I've seen before include "Smattering" , "Small quantity of (differing) colour" , "Colour slightly; trace" , "Slight trace; colour" , "Hint of colour" .)