Boy read brightly about such extortion (8,7)
I believe the answer is:
daylight robbery
'extortion' is the definition.
(daylight robbery can mean an extortionate practice)
'boy read brightly about' is the wordplay.
'about' indicates an anagram.
'boy'+'read'+'brightly'='boyreadbrightly'
'boyreadbrightly' anagrammed gives 'DAYLIGHT ROBBERY'.
'such' is the link.
(Other definitions for daylight robbery that I've seen before include "Extortion" , "audacious act of exploitation" , "Blatant overcharging" , "Scandalous" , "as shoplifting usually is" .)