Takes in sights and sounds of Celtic Countries' capitals (4)

I believe the answer is:

sees

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'takes in sights' is the definition.
'sees' can be an answer for 'sights'. I am unsure of the 'takes in' bit.

'sounds of celtic countries' capitals' is the wordplay.
'sounds of' shows a homophone (sound like) (I've seen 'sound of' mean this).
'celtic' becomes 'C'.
'countries' capitals' becomes 's' (I can't explain this - if you can you should believe this answer much more).
'c' sounds like 'see'.
'see'+'s'='SEES'

'and' acts as a link.

Can you help me to learn more?

(Other definitions for sees that I've seen before include "Watches" , "Spots" , "Bishops' dioceses" , "Observes the bishops' domains" , "Bishoprics" .)

I've seen this clue in the Sydney Morning Herald.

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