Again signals one's sorrow (7)

I believe the answer is:

remorse

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'sorrow' is the definition.
(remorse is a kind of sorrow)

'again signals one's' is the wordplay.
'again' becomes 're' (prefix meaning 'again').
'signals one's' becomes 'morse' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
're'+'morse'='REMORSE'

Can you help me to learn more?

(Other definitions for remorse that I've seen before include "A feeling of deep regret" , "compassion" , "Feeling of guilt" , "Pity" , "display of conscience" .)

I've seen this clue in the Evening Standard.

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