Carry out a couple of poles to plant in piece of land (8)
I believe the answer is:
transact
'carry out' is the definition.
(I've seen this before)
'a couple of poles to plant in piece of land' is the wordplay.
'a couple of poles' becomes 'ans' (I am not sure about this - if you are sure you should believe this answer much more).
'to plant in' means one lot of letters goes inside another.
'piece of land' becomes 'tract' (synonyms).
'ans' placed inside 'tract' is 'TRANSACT'.
Can you help me to learn more?
(Other definitions for transact that I've seen before include "Conduct business, negotiate" , "Buy or sell" , "Carry out, like business" , "Perform or carry out business" , "Deal with" .)