Crossword Genius

Is he saintly? Yes, if only on Monday! (5)

Ross

I believe the answer is:

simon

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

'is he' is the definition.

'saintly? yes if only on monday' is the wordplay.
I cannot quite understand how this works, but
'on' is present in the answer.
'monday' could be 'm' and 'm' is found in the answer.
The remaining letters 'si' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for simon that I've seen before include "- and Garfunkel" , "Simple chap" , "See 1" , "Simple pieman" , "Apostle Peter's other name" .)

I've seen this clue in the Evening Standard.
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