Business concerning private eye and the Queen (8)
I believe the answer is:
retailer
'business' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'concerning private eye and the queen' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'private eye' becomes 'tail' (I've seen this before).
'and' means one lot of letters go next to another.
'the queen' becomes 'ER' (Elizabeth Regina).
're'+'tail'+'er'='RETAILER'
Can you help me to learn more?
(Other definitions for retailer that I've seen before include "High street trader?" , "One who sells goods to the geneal public" , "Purveyor" , "teller" , "Store-keeper" .)