One takes steps to destroy them (5)
I believe the answer is:
pests
'one takes' is the definition.
Although both the answer and definition are plural nouns, I don't see how they can define each other.
'steps to destroy them' is the wordplay.
'steps' anagrams to 'PESTS'.
However, I am unsure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for pests that I've seen before include "Take steps to troublesome animal." , "Steps (anag.)" , "Steps taken about nuisances" , "Persistently annoying persons" .)