A certain amount of latent heat (5)

I believe the answer is:

tenth

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'a certain amount' is the definition.
The definition and answer can be both quantities as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'of latent heat' is the wordplay.
'of' says the answer is hidden in the clue.
'TENTH' is hidden within 'latent heat'.

Can you help me to learn more?

(Other definitions for tenth that I've seen before include "0.1" , "Fraction; last in the hit parade?" , "Fraction in tithe" , "Decimal part?" , "Tithe proportion" .)

I've seen this clue in the Evening Standard.

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