She has too much to drink, in short (3)
I believe the answer is:
gal
'she' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see an association between them that I can't see?
'too much to drink in short' is the wordplay.
'too much' becomes 'g' (I am not sure about this - if you are sure you should believe this answer much more).
'to drink' becomes 'ale' (type of beer).
'in short' means to remove the last letter.
'ale' with its final letter taken away is 'al'.
'g'+'al'='GAL'
'has' acts as a link.
Can you help me to learn more?
(Other definitions for gal that I've seen before include "An American girl, cowboy vintage" , "US female" , "Girl from American west" , "measure of acceleration?" , "Young woman (colloq.)" .)