Continue to feel tired? This may be about alcohol (6)
I believe the answer is:
flagon
'continue to feel tired? this' is the definition.
The definition suggests a singular noun which matches the answer.
'be about alcohol' is the wordplay.
'be' becomes 'fla' (I can't justify this - if you can you should believe this answer much more).
'about' is a reversal indicator.
'alcohol' becomes 'nog' (as in eggnog).
'nog' back-to-front is 'gon'.
'fla'+'gon'='FLAGON'
'may' acts as a link.
Can you help me to learn more?
(Other definitions for flagon that I've seen before include "Large drinks container" , "Large vessel for beverages" , "Snow White companion" , "Red or white container" , "Drinking vessel" .)