Crossword Genius

Dish used by photographers? (5)

Ross

I believe the answer is:

plate

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

'dish' is the definition.
(plate is a kind of dish)

'by photographers?' is the wordplay.
I cannot quite understand how this works, but
'by' could be 'at' and 'at' is located in the answer.
This explanation may well be incorrect...

'used' acts as a link.

Can you help me to learn more?

(Other definitions for plate that I've seen before include "Thin sheet, as of glass" , "Put film on" , "trophy" , "Leapt (anag.)" , "From which food is eaten or served" .)

I've seen this clue in The Globe and Mail.
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