Blue coin follows contents of binder (8)
I believe the answer is:
indecent
'blue' is the definition.
(I've seen this before)
'coin follows contents of binder' is the wordplay.
'coin' becomes 'cent' (cent is a kind of coin).
'follows' means one lot of letters go next to another.
'contents of' indicates the central letters (the letters on the inside of the word).
The central letters of 'binder' are 'inde'.
'cent' put after 'inde' is 'INDECENT'.
(Other definitions for indecent that I've seen before include "Unbecoming, obscene" , "Lewd" , "not appropriate" , "Offensive to common modesty" , "Rude, improper" .)