Poor Roger badly hit by blatant overcharging (8,7)
I believe the answer is:
daylight robbery
'blatant overcharging' is the definition.
(I've seen this before)
'poor roger badly hit by' is the wordplay.
'poor' is an anagram indicator.
'roger'+'badly'+'hit'+'by'='rogerbadlyhitby'
'rogerbadlyhitby' is an anagram of 'DAYLIGHT ROBBERY'.
(Other definitions for daylight robbery that I've seen before include "as shoplifting usually is" , "Blatant overcharging" , "A shameless swindle" , "Extortion" , "Scandalous" .)