Crossword Genius

Drinks provider still coming back round to consume sandwich (3,7)

Ross

I believe the answer is:

tea trolley

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'drinks provider still coming back' is the definition.
I can't tell whether this defines the answer.

'round to consume sandwich' is the wordplay.
'round' means one lot of letters goes inside another.
'to consume' becomes 'eat' (to consume something is to eat it).
'sandwich' becomes 'trolley' (I can't justify this - if you can you should give a lot more credence to this answer).
'eat' put inside 'trolley' is 'TEA-TROLLEY'.

Can you help me to learn more?

(Other definitions for tea trolley that I've seen before include "From which a waiter might serve" , "It brings drinks" , "Server of refreshments" .)

I've seen this clue in The Independent.
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