Toothy enthusiast going to grievous extremes (5)

I believe the answer is:

fangs

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'toothy enthusiast going to grievous extremes' is the definition.
I can't tell whether this defines the answer.

'enthusiast going to grievous extremes' is the wordplay.
'enthusiast' becomes 'fan' (fan is a kind of enthusiast).
'going to' says to put letters next to each other.
'extremes' says to hollow out the word (remove centre letters).
'grievous' with its centre taken out is 'gs'.
'fan'+'gs'='FANGS'

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(Other definitions for fangs that I've seen before include "Large pointed teeth" , "Teeth of, say, wolf" .)

I've seen this clue in the Evening Standard.

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