It's talked about among potato-pickers (5)
I believe the answer is:
topic
'it's talked' is the definition.
I can't tell whether this definition defines the answer.
'about among potato-pickers' is the wordplay.
'about' indicates the answer is hidden within the clue.
'TOPIC' can be found hidden inside 'among potato pickers'.
Can you help me to learn more?
(Other definitions for topic that I've seen before include "Theme of discourse" , "Talking point" , "Subject matter of a conversation or discussion" , "Subject (of speech, etc)" , "Subject (of, eg, speech)" .)