Romeo consumed by drink to go under (5)
I believe the answer is:
drown
'go under' is the definition.
(I've seen this in another clue)
'romeo consumed by drink' is the wordplay.
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'consumed by' is an insertion indicator (inserted letters get consumed).
'drink' becomes 'down' (to down something can mean to drink it quickly).
'r' going within 'down' is 'DROWN'.
'to' is the link.
(Other definitions for drown that I've seen before include "Die from submersion in liquid" , "Go under" , "Die in water" , "Submerge, maybe fatally" , "Swamp" .)