Crossword Genius

Little island that could stun the world? (7)

Ross

I believe the answer is:

rockall

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

'little island' is the definition.
'rockall' can be an answer for 'island' (I've seen this before). I'm not certain of the 'little' bit.

'could stun the world?' is the wordplay.
I cannot really understand how this works, but
'stun' could be 'rock' (both can mean to shock) and 'rock' is located in the answer.
The remaining letters 'all' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'that' is the link.

Can you help me to learn more?

(Other definitions for rockall that I've seen before include "UK shipping forecast area" , "remote islet" , "Atlantic outcrop, annexed by UK in 1955" , "British Atlantic islet" , "Inch" .)

I've seen this clue in The Times.
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