They obsess about sudden movements on new currency (9)

I believe the answer is:

neurotics

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'they obsess' is the definition.
The definition suggests an adverb but the answer is not.

'sudden movements on new currency' is the wordplay.
'sudden movements' becomes 'tics' (I can't explain this - if you can you should believe this answer much more).
'on' means one lot of letters go next to another.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'currency' becomes 'euro' (currency of the Eurozone).
'n'+'euro'='neuro'
'tics' put after 'neuro' is 'NEUROTICS'.

'about' is the link.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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