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Power
car
using
the
sun
–
at
the
start
one’s
a
bundle
of
nerves
(5,6)
Power car using the sun – at the start one’s a bundle of nerves (5,6)
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The definition is at the end of the clue.
How the clue works
The wordplay is a charade: SOLAR for using the sun, then P (the physics symbol for Power), then LEXUS (a luxury Japanese car) — with SOLAR placed at the start as the indicator demands. Put together they give SOLAR PLEXUS, which fits the definition one's a bundle of nerves in the upper abdomen.