Introduction of Romance language round Spain (4-2)

I believe the answer is:

lead-in

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'introduction' is the definition.
(I've seen this before)

'romance language round spain' is the wordplay.
'romance language' becomes 'ladin' (I can't explain this - if you can you should believe this answer much more).
'round' is an insertion indicator.
'spain' becomes 'e' (abbreviation for Espana).
'ladin' enclosing 'e' is 'LEAD-IN'.

'of' is the link.

Can you help me to learn more?

(Other definitions for lead-in that I've seen before include "Introduction to subject" , "Introductory passage" , "Introduction, preamble" .)

I've seen this clue in The Telegraph.

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