Crossword Genius

A routine king wasted with unknown divergence (7)

Ross

I believe the answer is:

anomaly

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

'divergence' is the definition.
(thesaurus)

'a routine king wasted with unknown' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is found within the answer.
'unknown' could be 'y' (algebra) and 'y' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for anomaly that I've seen before include "Deviation from the norm or common" , "Unexpected result" , "eccentricity" , "Deviation from the norm or expected" , "Out-of-line result" .)

I've seen this clue in The Hindu.
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