Crossword Genius

Working doctor with niece regularly wearing tiara (9)

Ross

I believe the answer is:

coroneted

'wearing tiara' is the definition.
(wearing a coronet)

'working doctor with niece regularly' is the wordplay.
'working' indicates anagramming the letters.
'with' means one lot of letters go next to another.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternating letters of 'niece' are 'nee'.
'doctor' after 'nee' is 'needoctor'.
'needoctor' is an anagram of 'CORONETED'.

I've seen this clue in The Times.
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