Big wheel in UK pentathlon done, yet sample is taken (6,3)

I believe the answer is:

london eye

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

'big wheel' is the definition.
(I've seen this in another clue)

'uk pentathlon done yet sample is taken' is the wordplay.
'LONDON EYE' is hidden in amongst the letters.
But, I am unsure how the hidden word is indicated.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for london eye that I've seen before include "Wheel with views of capital" , "Iconic attraction" , "Ferris wheel" , "South Bank attraction" , "Big Thames wheel" .)

I've seen this clue in the Sydney Morning Herald.

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