Give them weapon, and point backwards, indicating specific part of body (6)
I believe the answer is:
armpit
'part of body' is the definition.
('armpit' is part of 'body')
'give them weapon and point backwards indicating specific' is the wordplay.
I cannot really see how this works, but
'weapon' could be 'arm' (synonyms) and 'arm' is present in the answer.
'point' could be 'pit' (pit is a kind of point) and 'pit' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for armpit that I've seen before include "Where to put a crutch" , "Depression under an upper limb" , "Hairy spot" , "Hairy hollow" , "part of the body" .)