Spyglasses let cops see corruption (10)

I believe the answer is:

telescopes

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

'spyglasses let cops see corruption' is the definition.
I know that 'see' relates to this answer.

'let cops see corruption' is the wordplay.
'corruption' indicates an anagram.
'let'+'cops'+'see'='letcopssee'
'letcopssee' is an anagram of 'TELESCOPES'.

Can you help me to learn more?

(Other definitions for telescopes that I've seen before include "Optical instruments" , "Makes smaller or shorter" .)

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

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