Jumper goes over gap? That's just great (7)

I believe the answer is:

tophole

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'just great' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'jumper goes over gap?' is the wordplay.
'jumper' becomes 'top' ().
'goes over' says to put letters next to each other.
'gap?' becomes 'hole' (hole is a kind of gap).
'top'+'hole'='TOPHOLE'

'that's' is the link.

Can you help me to learn more?

(Another definition for tophole that I've seen is " Excellent".)

I've seen this clue in The Irish Times.

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