This is one of these signs of anger (10)

I believe the answer is:

crosswords

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'these signs of anger' is the definition.
The definition suggests an adverb but the answer is not.

'this is one' is the wordplay.
'this' becomes 'crossword' (the crossword currently being solved is an example).
'is one' becomes 's' (I can't explain this - if you can you should give a lot more credence to this answer).
'crossword'+'s'='CROSSWORDS'

'of' is the link.

Can you help me to learn more?

(Another definition for crosswords that I've seen is " which call for solutions".)

I've seen this clue in the Sydney Morning Herald.

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