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PM's instruction to contact man in Kabul, fellow having disappeared (9)

Ross

I believe the answer is:

callaghan

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'pm's' is the definition.
(James Callaghan, UK prime minister 1976-1979)

I don't understand how the remainder of the clue works.

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(Other definitions for callaghan that I've seen before include "Former prime minister" , "3's Labour predecessor" , "Former PM" .)

I've seen this clue in The Independent.
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