"What Skip Wilkins was describing became known as radar." (BBC.)
Is What the direct object of was describing? Or, is What a fronted fused relative pronoun and What (...) became known as radar the direct object of was describing?
" It is called a nominal relative clause. htm
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"[What Skip Wilkins was describing] became known as radar."
The content clause (bracketed) is the subject of the verb "became." It is called a nominal relative clause.
You can think of it being "The thing that Skip Wilkins was describing became known as radar."