Last show jumper tells blatant lie (7)

I believe the answer is:

whopper

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

'last show jumper' is the wordplay.
'last' indicates one should take the final letters.
'jumper' becomes 'hopper' (I've seen this before).
The last letter of 'show' is 'w'.
'w'+'hopper'='WHOPPER'

'tells' acts as a link.
This may not be right. It may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for whopper that I've seen before include "Blatant lie" , "In slang, it's very big - like a lie or fish" , "Enormous lie" , "something with no substance in it" , "Humongous untruth" .)

I've seen this clue in The Irish Times.

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