Clock mechanism S African fellows found in east of France (10)
I believe the answer is:
escapement
'clock mechanism' is the definition.
(I've seen this before)
's african fellows found in east of france' is the wordplay.
's african' becomes 'cape' (I can't explain this - if you can you should believe this answer much more).
'fellows' becomes 'men' (fellow can mean a man).
'found in' is an insertion indicator.
'east of france' becomes 'est' ('east' in French).
'cape'+'men'='capemen'
'capemen' put inside 'est' is 'ESCAPEMENT'.
Can you help me to learn more?
(Other definitions for escapement that I've seen before include "Part of A Clockwork" , "One-time flight" , "Part of watch mechanism" , "Clock or watch mechanism" , "piano piece" .)