Mel's only moving in a serious manner (8)

I believe the answer is:

solemnly

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'in a serious manner' is the definition.
I can't judge whether this definition defines the answer.

'mel's only moving' is the wordplay.
'moving' indicates anagramming the letters.
'mels'+'only'='melsonly'
'melsonly' with letters rearranged gives 'SOLEMNLY'.

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(Other definitions for solemnly that I've seen before include "in formal and dignified way" , "Gravely and sedately" , "In a formal and dignified manner" .)

I've seen this clue in The Daily Express.

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