Crossword Genius

Trouble in Naples is not hurting (8)

Ross

I believe the answer is:

painless

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

'not hurting' is the definition.
(I've seen this before)

'trouble in naples is' is the wordplay.
'naples is' anagrams to 'PAINLESS'.
But, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for painless that I've seen before include "Trouble free" , "Easy - without suffering" , "Involving little effort; not hurting" , "Undemanding" , "Needing little effort" .)

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