Where a milkmaid could get a bit tired during the day (5)
I believe the answer is:
dairy
'where a milkmaid could' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'a bit tired during the day' is the wordplay.
'a bit' becomes 'i' (resembles r, a binary digit or bit).
'tired' becomes 'r' (I can't justify this - if you can you should give a lot more credence to this answer).
'during' is an insertion indicator.
'i'+'r'='ir'
'ir' going into 'day' is 'DAIRY'.
'get' is the link.
Can you help me to learn more?
(Other definitions for dairy that I've seen before include "Produced from milk" , "Business supplying milk and its products" , "Creamery" , "Milking parlour" , "milking cows here" .)