Rough luck initially filling in binder (9)
I believe the answer is:
inclement
'rough' is the definition.
(I've seen this before)
'luck initially filling in binder' is the wordplay.
'initially' suggests taking the first letters.
'filling' means one lot of letters goes inside another.
'binder' becomes 'cement' (I've seen this before).
The first letter of 'luck' is 'l'.
'in'+'cement'='incement'
'l' going into 'incement' is 'INCLEMENT'.
(Other definitions for inclement that I've seen before include "Weather so awful" , "Such harsh weather" , "severe" , "Unpleasantly showery" , "(Of weather) bad" .)