Crossword Genius

Correct, unfortunately, about headless cleric (6)

Ross

I believe the answer is:

rector

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

'cleric' is the definition.
(I've seen this before)

'correct unfortunately about headless' is the wordplay.
I cannot quite see how this works, but
'about' could be 're' (common abbreviation for 'with reference to') and 're' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for rector that I've seen before include "Church official" , "Cleric" , "Parish priest" , "Preacher Man" , "Churchman" .)

I've seen this clue in The Mirror.
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