One stocktaking? (7)
I believe the answer is:
rustler
'one stocktaking?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
This is all the clue.
Can you help me to learn more?
(Other definitions for rustler that I've seen before include "One who takes livestock" , "person taking stock" , "Cattle-robber" , "Stealer of livestock" , "one whose stock-taking is dishonest" .)