Crossword Genius

German invested in unstable euro, not following expected course (5)

Ross

I believe the answer is:

rogue

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'not following expected course' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'german invested in unstable euro' is the wordplay.
'german' becomes 'g' (abbreviation).
'invested in' is an insertion indicator.
'unstable' is an anagram indicator.
'euro' with letters rearranged gives 'roue'.
'g' placed within 'roue' is 'ROGUE'.

Can you help me to learn more?

(Other definitions for rogue that I've seen before include "Scoundrel, knave" , "Miscreant" , "Dishonest man" , "Scallywag" , "Rascal or reprobate" .)

I've seen this clue in The Independent.
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