Devout person gets garment for flasher (6)

I believe the answer is:

strobe

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'flasher' is the definition.
(I've seen this before)

'devout person gets garment' is the wordplay.
'devout person' becomes 'st' (I can't justify this - if you can you should believe this answer much more).
'gets' says to put letters next to each other.
'garment' becomes 'robe' (robe is a type of garment).
'st'+'robe'='STROBE'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for strobe that I've seen before include "Flashy type" , "Flashing-light device" , "Rapidly flashing lighting often used on stage" , "Flashing lamp" , "Flashing disco light" .)

I've seen this clue in The Times and The Sunday Times.

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