More stout for redhead consumed by drink (6)
I believe the answer is:
larger
'more stout' is the definition.
(I've seen this before)
'redhead consumed by drink' is the wordplay.
'redhead' becomes 'r' (the head/first letter of 'red').
'consumed by' is an insertion indicator (inserted letters get consumed).
'drink' becomes 'lager' (lager is a kind of drink).
'r' put into 'lager' is 'LARGER'.
'for' acts as a link.
(Other definitions for larger that I've seen before include "Comparatively bigger" , "Greater in size" , "Ebullient person may be describes as ?? than life" , "bigger,greater" , "More comprehensive" .)