For example, award for knocking back alcoholic drink (6)
I believe the answer is:
eggnog
'alcoholic drink' is the definition.
(type of alcoholic drink)
'for example award for knocking back' is the wordplay.
'for example' becomes 'e.g.' (short for 'exempli gratia', 'for example' in Latin).
'award' becomes 'nog' (I can't justify this - if you can you should believe this answer much more).
'for' means one lot of letters go next to another (I've seen this in other clues).
'back' indicates one should take the final letters (the letter at the back).
The final letter of 'knocking' is 'g'.
'nog' after 'g' is 'gnog'.
'eg'+'gnog'='EGGNOG'
Can you help me to learn more?
(Other definitions for eggnog that I've seen before include "Drink similar to advocaat" , "spirits in me?" , "Punch made with eggs and alcohol" , "Festive dairy beverage" , "Dairy-based drink" .)