Johann Sebastian's address in Wales (4)

I believe the answer is:

bach

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'address in wales' is the definition.
'bach' can be an answer for 'address' (I have seen 'Affectionate address' mean 'bach' so perhaps 'address' could also mean 'bach'). I'm unsure of the 'in wales' bit.

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

Can you help me to learn more?

(Other definitions for bach that I've seen before include "Affectionate address" , "musical great" , "endearing Welsh appellation" , "Welsh term of endearment" , "musician" .)

I've seen this clue in The Sun.

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