This onion on reflection could make you cry (4)

I believe the answer is:

bulb

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'this onion' is the definition.
(onion is a type of bulb)

I don't understand the remainder of the clue.

(Other definitions for bulb that I've seen before include "Light fitting" , "shiner" , "Reproductive organ in some plants" , "daffodil here" , "From which a tulip or light comes" .)

I've seen this clue in The Times.

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