Crossword Genius

One who disappeared in grinding lunar cold (4,5)

Ross

I believe the answer is:

lord lucan

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'one who disappeared' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'grinding lunar cold' is the wordplay.
'grinding' indicates anagramming the letters (letters must be ground into a new form).
'lunar'+'cold'='lunarcold'
'lunarcold' is an anagram of 'LORD LUCAN'.

'in' acts as a link.

Can you help me to learn more?

(Another definition for lord lucan that I've seen is " Missing man".)

I've seen this clue in The Guardian.
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