Slide off and move sideways (5)
I believe the answer is:
sidle
'move sideways' is the definition.
(I've seen this in another clue)
'slide off' is the wordplay.
'off' is an anagram indicator.
'slide' anagrammed gives 'SIDLE'.
'and' is the link.
(Other definitions for sidle that I've seen before include "steal" , "Move like a crab" , "Edge along laterally" , "Make cautious progress" , "Edge along furtively" .)