Crossword Genius

Food item taken with plenty of fluid? (4,3)

Ross

I believe the answer is:

bath bun

I'm a little stuck... Click here to teach me more about this clue!

'plenty of fluid?' is the definition.
The definition suggests a singular noun which matches the answer.

'food item taken' is the wordplay.
I cannot quite understand how this works, but
'food' could be 'bun' (bun is a kind of food) and 'bun' is located in the answer.
The remaining letters 'bath' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'with' acts as a link.

Can you help me to learn more?

(Other definitions for bath bun that I've seen before include "Small cake with spices and fruit" , "Rich, sweet little cake" , "Sweet spicy confection" .)

I've seen this clue in the Evening Standard.
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