Crossword Genius

Those Millwall heroes (5)

Ross

I believe the answer is:

lions

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

'heroes' is the definition.
The answer and definition can be both people as well as being plural nouns.
Perhaps there's an association between them I don't understand?

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

Can you help me to learn more?

(Other definitions for lions that I've seen before include "Large cats" , "Large carnivores" , "multinational tourists" , "Cats living in prides" , "Roaring cats" .)

I've seen this clue in the Evening Standard.
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