Crossword Genius

Milkman picks them up to spite me, somehow (7)

Ross

I believe the answer is:

empties

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

'milkman picks them up' is the definition.
I can't judge whether this defines the answer.

'spite me somehow' is the wordplay.
'somehow' indicates anagramming the letters.
'spite'+'me'='spiteme'
'spiteme' with letters rearranged gives 'EMPTIES'.

'to' is the link.

Can you help me to learn more?

(Other definitions for empties that I've seen before include "Vacates" , "drains" , "Bottles after the contents have been poured out" , "Returned bottles" , "they've nothing to offer" .)

I've seen this clue in The Mirror.
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