Crossword Genius

Flashy saint given gown that seems luminous in fourth fresco (6,6)

Ross

I believe the answer is:

strobe lights

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'flashy' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'saint given gown that seems luminous in fourth fresco' is the wordplay.
I cannot really see how this works, but
'saint' could be 'st' (abbreviation) and 'st' is present in the answer.
'gown' could be 'robe' (synonyms) and 'robe' is found in the answer.
'fourth fresco' could be 's' (4th letter of 'fresco') and 's' is located in the answer.
The remaining letters 'light' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Irish Times.
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