Use an instrument round the top of the roof to break in (6)

I believe the answer is:

burgle

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'break in' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for burgle that I've seen before include "Break in to 17 dn" , "do so is illegal!" , "Steal (from a house etc)" , "Enter building to steal" , "Break in and steal" .)

I've seen this clue in The Irish Independent.

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