Crabwise, at an angle (8)
I believe the answer is:
sideways
I believe this clue is a double definition.
'crabwise' is the first definition.
(I know that crabwise can be written as sideways)
'at an angle' is the second definition.
(thesaurus)
(Other definitions for sideways that I've seen before include "Obliquley, crabwise" , "Crabwise, at an angle" , "Lateral movement" , "from left to right?" , "Askance" .)