Crossword Genius

Rabble-rousing nurses head off Mary Berry in Glasgow (7)

Ross

I believe the answer is:

bramble

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

'berry in glasgow' is the definition.
The answer and definition can be both plants as well as being singular nouns.
Maybe you can see a link between them that I can't see?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for bramble that I've seen before include "Thorny bush" , "Gather fruit" , "Wild thorny shrub" , "Blackberry plant" , "Rough, prickly shrub" .)

I've seen this clue in The Independent.
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