Step over heaps (5)
I believe the answer is:
phase
'step' is the definition.
(I've seen this in another clue)
'heaps' is the wordplay.
'heaps' anagrams to 'PHASE'.
But, I'm not clear how the anagram is indicated.
'over' acts as a link.
Can you help me to learn more?
(Other definitions for phase that I've seen before include "Shape into stage" , "A particular point in the time of a cycle" , "Distinct stage" , "Carry out in stages" , "stage in process of development" .)