One part of body or another in which gun is deviously hidden (6)
I believe the answer is:
tongue
'one part of body or another in which gun is deviously hidden' is the definition.
'tongue' can be an answer for 'one part of body'. I'm unsure of the rest of the definition.
'which gun is deviously hidden' is the wordplay.
'which' becomes 'toe' (I can't explain this - if you can you should give a lot more credence to this answer).
'is deviously' indicates an anagram (I've seen this in other clues).
'hidden' indicates putting letters inside.
'gun' with letters rearranged gives 'ngu'.
'toe' placed around 'ngu' is 'TONGUE'.
(Other definitions for tongue that I've seen before include "For example, Danish" , "Go tune up what's in the mouth" , "Part of shoe or mouth" , "One gut in the mouth" , "Projecting strip" .)