Slave could produce a French waltz (5)
I believe the answer is:
valse
'a french waltz' is the definition.
'valse' can be an answer for 'waltz' ('waltz' in French). I am not certain of the 'a french' bit.
'slave could produce' is the wordplay.
'could produce' indicates anagramming the letters (I've seen this in other clues).
'slave' anagrammed gives 'VALSE'.
Can you help me to learn more?
(Other definitions for valse that I've seen before include "Steps taken in France" , "Dance" .)