She's knocking drink back at "The Galloping Nag" (6)
I believe the answer is:
angela
'she's' is the definition.
(I've seen this before)
'knocking drink back at the galloping nag' is the wordplay.
'knocking' is a reversal indicator.
'drink back' becomes 'ale' (type of beer. I am not sure about the 'back' bit.).
'at' means one lot of letters go next to another (I've seen this in other clues).
'the galloping' indicates an anagram (I've seen this in other clues).
'ale' written backwards gives 'ela'.
'nag' anagrammed gives 'ang'.
'ela' after 'ang' is 'ANGELA'.
Can you help me to learn more?
(Other definitions for angela that I've seen before include ". . . Lansbury (actress)" , "- Carter, English writer" , "Girl's name" , "Frau Merkel" , "woman" .)