6 down
A
sigh
of
relief
heard,
not
many
(1,3)
A sigh of relief heard, not many (1,3)
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The definition is at the end of the clue.
How the clue works
The definition is not many. You've got A to start, then FEW — which, when heard aloud, sounds just like "phew", that sigh of relief you let out when something goes right.