Saint Simon, in popular fiction (7)

I believe the answer is:

templar

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'saint simon in popular fiction' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

This is all the clue.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.

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