Crossword Genius

Mourn mental decline (6)


I believe the answer is:


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

'mental decline' is the wordplay.
'mental' can be anagrammed to 'LAMENT'.
Though, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for lament that I've seen before include "Mourn for; deplore" , "Express sorrow" , "complaint" , "Mourn, express regret" , "Song expressing grief" .)

I've seen this clue in The Mirror.
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