Heading for recognition of nobility (5)

I believe the answer is:

title

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'heading' is the definition.
(I know that title is a type of subhead)

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

Can you help me to learn more?

(Other definitions for title that I've seen before include "'The name of a book, say (5)'" , "Name, honorific" , "big role" , "Name - legal right" , "Mr or Mrs, say" .)

I've seen this clue in The Irish News.

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