Called for a step (4)
I believe the answer is:
rung
This clue is a double definition.
'called' is the first definition.
(ring can mean to call on the phone)
'a step' is the second definition.
(I've seen this in another clue)
'for' is the link.
(Other definitions for rung that I've seen before include "Telephoned" , "support for foot" , "Step up the ladder - called for" , "Level in a hierarchy" , "Tolled - step on ladder" .)