Clear away one side (8)
I believe the answer is:
outright
'clear' is the definition.
(I've seen this before)
'away one side' is the wordplay.
'away' becomes 'out' ('out' can be a synonym of 'away').
'one side' becomes 'right' (I've seen this before**).
'out'+'right'='OUTRIGHT'
(Other definitions for outright that I've seen before include "Clear" , "Without reservation or stipulation" , "Absolute - utter" , "Directly; without reservation" , "Without reservation or exception" .)