Heavenly extract of mangelwurzel (5)

I believe the answer is:

angel

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'heavenly extract' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'of mangelwurzel' is the wordplay.
'of' indicates the answer is hidden within the clue.
'ANGEL' is hidden within 'mangelwurzel'.

Can you help me to learn more?

(Other definitions for angel that I've seen before include "eg Gabriel" , "one might be recording" , "Heavenly body" , "Heavenely messenger" , "Christmas tree decoration" .)

I've seen this clue in the Evening Standard.

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