Small step taken in the void (5)
I believe the answer is:
space
'the void' is the definition.
(thesaurus)
'small step' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'step' becomes 'pace' (pace is a kind of step).
's'+'pace'='SPACE'
'taken in' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for space that I've seen before include "Empty area, may be outer" , "Emptiness" , "Free area" , "Room for capes" , "-- Capsule; -- bar" .)