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Very self-confident, wags frenziedly when given a gingersnap (10)

Ross

I believe the answer is:

swaggering

I'm a little stuck... Click here to teach me more about this clue!

'very' is the definition.
Both the definition and answer are adjectives. Maybe there's a link between them I don't understand?

'self-confident wags frenziedly when given a gingersnap' is the wordplay.
I cannot really understand how this works, but
an anagram of 'wags' is 'swag' which is within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for swaggering that I've seen before include "Boasting" , "Walking arrogantly" .)

I've seen this clue in the Evening Standard.
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