Crossword Genius

Require trophy, on reflection, to be engraved by concierge (6)

Ross

I believe the answer is:

porter

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

'concierge' is the definition.
(thesaurus)

'require trophy on reflection to be engraved' is the wordplay.
'PORTER' is hidden backwards in amongst the letters.
However, I am unsure how the hidden word is indicated.

'by' is the link.

Can you help me to learn more?

(Other definitions for porter that I've seen before include "Hotel luggage carrier" , "Cole - - , songwriter" , "Bearer" , "Baggage-handler" , "Cole - - , composer" .)

I've seen this clue in The Irish Times.
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