Latest drink supplier finally brought in to add energy to tournament (7-3)

I believe the answer is:

stirrup-cup

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

'latest drink' is the definition.
'stirrup cup' can be an answer for 'drink' (stirrup cup is a kind of drink). I am not sure about the 'latest' bit.

'supplier finally brought in to add energy to tournament' is the wordplay.
'finally' suggests the final letters.
'brought in to' means one lot of letters goes inside another.
'add energy' becomes 'stirup' (I can't justify this - if you can you should believe this answer much more).
'to tournament' becomes 'cup' (eg the World Cup).
The final letter of 'supplier' is 'r'.
'r' placed within 'stirup' is 'stirrup'.
'stirrup'+'cup'='STIRRUP-CUP'

Can you help me to learn more?

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.