Poses on street over there, before heading into Spanish capital (4)

I believe the answer is:

sits

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'poses on street' is the definition.
'sits' can be an answer for 'poses' (I've seen this before). I am unsure of the 'on street' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for sits that I've seen before include "Perches" , "Takes a seat for the painter" , "Is in session" , "Poses for portrait" , "Poses for a painter" .)

I've seen this clue in The Irish Times.

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