Crossword Genius

Clergymen who could have been sad once? (7)

Ross

I believe the answer is:

deacons

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

'clergymen' is the definition.
(deacon is a kind of clergyman)

'could have been sad once?' is the wordplay.
'sad once' can be anagrammed to 'DEACONS'.
But, I'm unsure how the anagram is indicated.

'who' is the link.

Can you help me to learn more?

(Another definition for deacons that I've seen is " They rank just below priests".)

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