Flier right to have a drink (4)
I believe the answer is:
beer
'a drink' is the definition.
(I know that beer is a type of beer)
'flier right to have' is the wordplay.
'right' indicates one should take the final letters (the letter on the right of the word).
'to' means one lot of letters go next to another (I've seen this in other clues).
'have' becomes 'bee' (I can't explain this - if you can you should believe this answer much more).
The final letter of 'flier' is 'r'.
'r' put after 'bee' is 'BEER'.
Can you help me to learn more?
(Other definitions for beer that I've seen before include "Drink with a head" , "Fermented alcoholic beverage" , "The standard English drink" , "Brewery product" , "Drink using hops, malt, etc" .)