No part for a regular customer (6)

I believe the answer is:

patron

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

'a regular customer' is the definition.
(I've seen this before)

'no part' is the wordplay.
'no part' anagrams to 'PATRON'.
However, I'm not clear how this is indicated.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for patron that I've seen before include "Patrick for Ireland, for example" , "One who protects" , "Restaurant customer" , "angel" , "Sponsor or supporter as of the arts" .)

I've seen this clue in The Irish Independent.

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