5 down
One
expression
of
approval
or
several
(4)
One expression of approval or several (4)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
Here several is the definition, pointing to the plural of "aye". The wordplay builds it as a charade: "One" gives A and "expression of approval" gives YES, and stitching them together makes AYES.