7 down
Indication
of
‘again’
verbally
supported
by
a
boy,
and
why
(6)
Indication of ‘again’ verbally supported by a boy, and why (6)
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The definition is at the end of the clue.
How the clue works
The definition is why — as in a cause or explanation. You've got RE (that prefix meaning "again") then A (just "a") then SON (a boy), all stacked up together.