Good luck to choir performing around middle of the week (7)
I believe the answer is:
cheerio
'good luck' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'choir performing around middle of the week' is the wordplay.
'performing' is an anagram indicator.
'around' indicates putting letters inside.
'middle of the week' becomes 'ee' (middle letters of the word 'week').
'choir' is an anagram of 'chrio'.
'chrio' placed around 'ee' is 'CHEERIO'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for cheerio that I've seen before include "for so long!" , "Say this before drinking" , "Ta-ta" , "Bye-bye" , "See you" .)