Crossword Genius

Able to collapse (10)

Ross

I believe the answer is:

telescopic

(Other definitions for telescopic that I've seen before include "(Of an instrument) capable of being retracted and protruded" , "Like some gun sights" , "Capable of retraction and protrusion" , "Able to see far" , "Police sect (anag)" .)

I've seen this clue in The Times.
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