Great lump taken from turf at source (5)

I believe the answer is:

fatso

'great lump' is the definition.
(I've seen this before)

'taken from turf at source' is the wordplay.
'taken from' indicates a hidden word.
'FATSO' is hidden in the letters of 'turf at source'.

(Other definitions for fatso that I've seen before include "Plump person" , "Great lump" , "Derogatory term for an overweight person" .)

I've seen this clue in The Telegraph.

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