Keep away from an abyss (5)
I believe the answer is:
avoid
'keep away' is the definition.
(I've seen this in another clue)
'an abyss' is the wordplay.
'an' becomes 'a'.
'abyss' becomes 'void' (I can't justify this - if you can you should believe this answer much more).
'a'+'void'='AVOID'
'from' acts as a link.
Can you help me to learn more?
(Other definitions for avoid that I've seen before include "Shy away from" , "Fend off" , "Stay clear of" , "Evade - escape" , "Sidestep" .)