One intoxicated by a letter in red ink, perhaps? (7)
I believe the answer is:
drinker
'one intoxicated' is the definition.
I can't tell whether this defines the answer.
'a letter in red ink perhaps?' is the wordplay.
'a letter' becomes 'r' ().
'in' means one lot of letters goes inside another.
'perhaps?' indicates an anagram (I've seen 'perhaps' mean this).
'red'+'ink'='redink'
'redink' is an anagram of 'dinker'.
'r' put within 'dinker' is 'DRINKER'.
'by' is the link.
Can you help me to learn more?
(Other definitions for drinker that I've seen before include "Inebriate" , "Tippler" , "Imbiber, toper" , "Consumer of liquid, probably alcohol" .)