Fiercely vigilant person put on covering (piece of cloth) (6)

I believe the answer is:

dragon

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'fiercely vigilant person' is the definition.
'dragon' can be an answer for 'person' (dragon is a kind of person). I am not certain of the 'fiercely vigilant' bit.

'put on covering piece of cloth' is the wordplay.
'put on' becomes 'don' (synonyms).
'covering' is an insertion indicator.
'piece of cloth' becomes 'rag' (rag is a kind of piece of cloth).
'don' placed around 'rag' is 'DRAGON'.

Can you help me to learn more?

(Other definitions for dragon that I've seen before include "Seventeen [HARRIDAN]" , "eg Puff, Fafner" , "Mythical fire-breather" , "[TERMAGANT]" , "Fearsome woman" .)

I've seen this clue in The Hindu.

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