They look mischievous, poking far-sighted people (9)

I believe the answer is:

searchers

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'they look' is the definition.
Although both the answer and 'look' are nouns, they are not in the same form of the noun.

'mischievous poking far-sighted people' is the wordplay.
'mischievous' becomes 'arch' (arch can mean mischievous or playful).
'poking' means one lot of letters goes inside another (poke can mean to create a hole in).
'far-sighted people' becomes 'seers' (seer is a kind of person. I am not sure about the 'far-sighted' bit.).
'arch' inserted inside 'seers' is 'SEARCHERS'.

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I've seen this clue in The Guardian.

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