Crossword Genius

Muse endlessly about this, for example (7)

Ross

I believe the answer is:

problem

'this for example' is the definition.
(the crossword clue is a problem to be solved)

I can't explain the rest of the clue.

(Other definitions for problem that I've seen before include "Difficulty (these days, of any kind)" , "Quandary or dilemma" , "Brainteaser" , "Difficult matter to solve" , "Question or source of perplexity" .)

I've seen this clue in The Guardian.
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