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Onion, or what people do when cutting one back (4)

Ross

I believe the answer is:

bulb

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This clue could be a double definition.

'onion' is the first definition.
The definition and answer can be both plants as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'what people do when cutting one back' is the second definition.
The definition suggests a singular noun which matches the answer.

'or' acts as a link.

Can you help me to learn more?

(Other definitions for bulb that I've seen before include "shiner" , "Tulip, for example" , "Corm; electric light" , "Reproductive organ in some plants" , "Eg, onion" .)

I've seen this clue in The Telegraph.
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