A light show to start with? (5)

I believe the answer is:

pilot

I'm a little stuck... Click here to teach me more about this clue!

'a light show' is the definition.
'pilot' can be an answer for 'show' (pilot is a kind of show). I am not sure about the 'a light' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for pilot that I've seen before include "air traffic controller?" , "Plane driver" , "Navigator" , "One licensed to fly" , "Lead" .)

I've seen this clue in the Evening Standard.

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