Big lie (7)

I believe the answer is:

whopper

'big lie' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for whopper that I've seen before include "something with no substance in it" , "Enormous lie" , "as related by angler?" , "that 13 [TRUTH SERUM] might detect?" , "large portion?" .)

I've seen this clue in the Penny Press and The Telegraph.

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