Plain clothes for a soldier (or a Muslim jurist?) (5)

I believe the answer is:

mufti

(Other definitions for mufti that I've seen before include "Plain clothes - Muslim legal expert" , "Civilian clothes worn by service personnel" , "Civvies; Muslim legal expert" , "Civilian clothing for a military person" , "No official dress" .)

I've seen this clue in The Guardian.

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