Sounds like something barman might ask regular? (5)

I believe the answer is:

usual

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'regular?' is the definition.
('usual' can be similar in meaning to 'regular')

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for usual that I've seen before include "Normal, customary" , "Common or garden" , "Normally done" , "Customary - customary drink" , "Unexceptional" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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