Pitch article about unknown wild child (6)

I believe the answer is:

tarzan

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'wild child' is the definition.
The definition suggests a singular noun which matches the answer.

'pitch article about unknown' is the wordplay.
'pitch' becomes 'tar' (synonyms).
'article' becomes 'an' (English indefinite article).
'about' says to put letters next to each other.
'unknown' becomes 'z' (represents an unknown value in algebra).
'an' put after 'z' is 'zan'.
'tar'+'zan'='TARZAN'

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(Other definitions for tarzan that I've seen before include "Earl of Greystoke" , "John Clayton, Lord Greystoke" , "Jungle hero of Edgar Rice Burroughs" , "Edgar Rice Burroughs's fictional apeman" , "Strong and agile man" .)

I've seen this clue in The Independent.

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