Profit from performance delivered by soldiers (6)
I believe the answer is:
return
'profit' is the definition.
(I've seen this before)
'performance delivered by soldiers' is the wordplay.
I cannot really see how this works, but
'performance' could be 'turn' (turn is a kind of performance) and 'turn' is located in the answer.
'soldiers' could be 're' (Royal Engineers) and 're' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'from' acts as a link.
Can you help me to learn more?
(Other definitions for return that I've seen before include "Reappear" , "Send, bring or come back" , "Give or come back" , "Come/go back" , "Come back; profit" .)