Crossword Genius

Some expressing a sigh of relief (1,3)

Ross

I believe the answer is:

a few

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

'some' is the definition.
(I've seen this before)

'a sigh of relief' is the wordplay.
I cannot really understand how this works, but
'a' is found in the answer.
The remaining letters 'few' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'expressing' is the link.

Can you help me to learn more?

(Other definitions for a few that I've seen before include "Sundry" , "Certainly not many" .)

I've seen this clue in The Guardian.
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