Crossword Genius

Mourn mental decline (6)

Ross

I believe the answer is:

lament

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

'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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