Blatant lie (7)

I believe the answer is:

whopper

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

This is all the clue.

(Other definitions for whopper that I've seen before include "Blatant lie" , "A great big lie - or fish" , "Huge one; lie" , "Enormous lie" , "that 13 [TRUTH SERUM] might detect?" .)

I've seen this clue in the Sydney Morning Herald, The Telegraph and The Times.

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