Rules changed for a singer (6)

I believe the answer is:

reigns

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

'rules' is the definition.
('reign' can be a synonym of 'rule')

'changed for a singer' is the wordplay.
'singer' can be anagrammed to 'REIGNS'.
Though, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for reigns that I've seen before include "Holds sway" , "Rules over like singer" , "Singer who governs" , "Rules as monarch" , "Rules over, occupies throne" .)

I've seen this clue in the Evening Standard.

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