Crossword Genius

Legendary, illusory Tory stronghold? (4)

Ross

I believe the answer is:

troy

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

'stronghold?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'legendary illusory tory' is the wordplay.
'tory' anagrams to 'TROY'.
Though, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for troy that I've seen before include "System of weights for measuring precious metals and gemstones" , "The pound - had twelve ounces, ancient city" , "Helen of --, beauty" , "City of Paris" , "Ancient city associated with a wooden horse" .)

I've seen this clue in the Evening Standard.
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