Crossword Genius

Note lord being heartless - or unthreatening? (4)

Ross

I believe the answer is:

mild

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'unthreatening?' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'note lord being heartless' is the wordplay.
'note' becomes 'mi' (as in 'do re mi').
'being heartless' says to hollow out the word (remove centre letters).
'lord' with its middle taken out is 'ld'.
'mi'+'ld'='MILD'

'or' acts as a link.

Can you help me to learn more?

(Other definitions for mild that I've seen before include "having little effect" , "Gentle and moderate" , "Calm" , "Not severe or harsh" , "Far from extreme" .)

I've seen this clue in The Guardian.
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