Open and rue making opening move (8)
I believe the answer is:
overture
'opening move' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'open and rue making' is the wordplay.
'open' becomes 'overt' (associated in meaning).
'and' means one lot of letters go next to another.
'making' indicates an anagram.
'rue' anagrammed gives 'ure'.
'overt'+'ure'='OVERTURE'
Can you help me to learn more?
(Other definitions for overture that I've seen before include "Orchestral piece" , "10 {COMPOSITION]" , "Opening music" , "offer" , "Orchestral prelude to opera" .)