The small telescopes surely spy ass legs more easily (3,7)

I believe the answer is:

spy glasses

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'the small telescopes surely' is the definition.
I know nothing about this answer so I can't tell whether this works.

'spy ass legs more easily' is the wordplay.
'more' says to put letters next to each other (some letters added to the previous ones).
'easily' is an anagram indicator.
'ass'+'legs'='asslegs'
'asslegs' is an anagram of 'glasses'.
'spy'+'glasses'='SPY GLASSES'

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

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