Crossword Genius

Call impostor briefly (5)

Ross

I believe the answer is:

phone

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'call' is the definition.
(phone can mean to call by telephone)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for phone that I've seen before include "Call (someone)" , "Covert monitoring of electronic exchanges" , "Short piece of electronic equipment" , "Call; eg, mobile" , "Mobile, perhaps" .)

I've seen this clue in The Times.
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