Club let in drunk regular (6)

I believe the answer is:

client

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

'regular' is the definition.
(I've seen this in another clue)

'club let in drunk' is the wordplay.
'club' becomes 'c' (this might be a standard abbreviation of which I'm unaware).
'drunk' indicates anagramming the letters.
'let'+'in'='letin'
'letin' anagrammed gives 'lient'.
'c'+'lient'='CLIENT'

Can you help me to learn more?

(Other definitions for client that I've seen before include "Person represented by lawyer" , "Computer program" , "Dependant, hanger-on" , "Professional's customer" , "Patron" .)

I've seen this clue in The Irish Times.

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