Simple movements will probably do for you (7,6)
I believe the answer is:
natural causes
'probably do for you' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'simple movements' is the wordplay.
I cannot quite understand how this works, but
'movements' could be 'causes' ('cause' can be a synonym of 'movement') and 'causes' is located in the answer.
The remaining letters 'natural' 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).
'will' is the link.
Can you help me to learn more?
(Other definitions for natural causes that I've seen before include "Common reason for death" , "Reason for death when not suspicious" , "Disease or old age as opposed to violence or accident" .)