Crossword Genius

Letter openers? (10)

Ross

I believe the answer is:

addressees

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

'openers?' is the definition.
Although both the answer and definition are plural nouns, I can't see how they can define each other.

'letter' is the wordplay.
I cannot really see how this works, but
'letter' could be 'see' (possible spelling of 'C' according to Chambers) and 'see' is found in the answer.
The remaining letters 'address' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for addressees that I've seen is " Group getting letters".)

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