Deceptive movement sounds weak in spirit (5)
I believe the answer is:
feint
'deceptive movement' is the definition.
(I've seen this before)
'sounds weak in spirit' is the wordplay.
I cannot quite understand how this works, but
'in' is present in the answer.
The remaining letters 'fet' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for feint that I've seen before include "Deceptive movement designed to distract" , "Deceptive motion" , "(Make a) deceptive move" , "False fencing trust sounds dim" , "Artifice" .)