Set foot on ground zero (5)
I believe the answer is:
froze
'set' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs occasionally mean the same thing.
'foot on ground zero' is the wordplay.
'foot' becomes 'f' (abbreviation).
'on' indicates putting letters inside.
'ground' is an anagram indicator ('grind' the letters into a new form).
'zero' with letters rearranged gives 'roze'.
'f' inserted within 'roze' is 'FROZE'.
Can you help me to learn more?
(Other definitions for froze that I've seen before include "suddenly stopped" , "stopped moving altogether" , "Became iced over" , "E.g. turned to ice" , "Stopped dead" .)