Columnist on easily losing some weight (5)

I believe the answer is:

stone

'weight' is the definition.
(stone is a kind of weight)

'columnist on easily losing some' is the wordplay.
'some' indicates a hidden word.
'STONE' is hidden in the letters of 'columnist on easily losing'.

(Other definitions for stone that I've seen before include "Beryl, ruby" , "Endocarp" , "Rag" , "that one will 26d at 8a [FLING at HIGHLAND GAMES]" , "Little rock" .)

I've seen this clue in The Telegraph.

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