Glue to fix a step (5)
I believe the answer is:
'glue' is the definition.
(I know that glue can be written as paste)
'fix a step' is the wordplay.
'fix' is an anagram indicator.
'astep' with letters rearranged gives 'PASTE'.
'to' acts as a link.
(Other definitions for paste that I've seen before include "Adhesive gum" , "Watery cement" , "Tapes (anag.)" , "It is used to stick wallpaper" , "foie gras" .)