Crossword Genius

Giant in unlikely story? (7)

Ross

I believe the answer is:

whopper

I'm a little stuck... Click here to teach me more about this clue!

'story?' is the definition.
(both can mean a lie)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for whopper that I've seen before include "Mammoth story" , "large portion?" , "Giant thing" , "Very large specimen" , "Huge thing - huge porky?" .)

I've seen this clue in The Times.
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