Crossword Genius

In fiction, Saint Simon (7)

Ross

I believe the answer is:

templar

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This clue might be a double definition.

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

'saint simon' is the second definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

Can you help me to learn more?

(Other definitions for templar that I've seen before include "Crusading" , "Member of religious and military order" , "barrister" , "Old Crusader Knight" , "Lawyer" .)

I've seen this clue in the Evening Standard.
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