They provide illumination for Spring Flower Show (5)

I believe the answer is:

bulbs

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'they' is the definition.
Both the definition and answer are plural nouns.
Maybe you can see a link between them that I don't see?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for bulbs that I've seen before include "Lamps -- daffodils" , "Eg, daffodils, tulips" , "Underground organs of such as tulips" , "Electric lights" .)

I've seen this clue in The Irish Independent.

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