Valued customer according to standard practice (7)

I believe the answer is:

regular

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'valued customer' is the definition.
'regular' can be an answer for 'customer' (regular is a kind of customer). I'm unsure of the 'valued' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for regular that I've seen before include "Serviceman" , "Uniform, even" , "fighter" , "Customary; done frequently" , "Normal, steady" .)

I've seen this clue in The Telegraph.

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