19 across
Discovered
Cuban
music
and
heavy
metal,
as
forgotten
(7)
Discovered Cuban music and heavy metal, as forgotten (7)
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The definition is at the beginning of the clue.
How the clue works
Right, so Discovered is your definition, pointing to RUMBLED in the sense of found out or detected. For the wordplay, take RUMBA for Cuban music and LEAD for heavy metal, stick them together, then knock out both A's since the clue says "as forgotten" — RUMBA loses its A to become RUMB, LEAD loses its A to become LED, and mashing RUMB and LED together gives you RUMBLED.