Some perhaps heard expressing relief (3)
I believe the answer is:
few
'some' is the definition.
(associated in meaning)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for few that I've seen before include "Hardly anyone" , "'''Many are called but ... are chosen'' (Bible) (3)'" , "Only one or two" , "Considerable number, ironically" , "Indefinite but small number" .)