To burn perhaps, this is often split (10)

I believe the answer is:

infinitive

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'to burn perhaps this is often split' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for infinitive that I've seen before include "uninflected word" , "term in grammar" , "Basic form of a verb" , "Verb form - I fit in vine (anag)" .)

I've seen this clue in The Telegraph.

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