Laterally (8)
I believe the answer is:
sideways
'laterally' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for sideways that I've seen before include "Walk this way, if you're a crab" , "Crabwise, at an angle" , "Movement of crab" , "Askance" , "Crabwise, laterally" .)