A disposition of arms (6)
I believe the answer is:
akimbo
'a disposition of arms' is the definition.
I can't tell whether this defines the answer.
'a disposition' is the wordplay.
I cannot quite see how this works, but
'a' is found in the answer.
The remaining letters 'kimbo' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for akimbo that I've seen before include "Ballet step" , "Hands-on-hips" , "Hands on hips, elbows bent out" , "Stance with hands on hips" , "(Standing) with hand on hips" .)