Crossword Genius

A drink to help recuperate (3)

Ross

I believe the answer is:

cup

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

Here is my best explanation:

'a drink' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'help recuperate' is the wordplay.
'help' says the answer is hidden in the clue (I've seen 'helping of' mean this (I've seen this in other clues)).
'CUP' is hidden in the letters of 'recuperate'.

'to' is the link.

Can you help me to learn more?