Subdivision of a stock farm at Wembley Central (6)
I believe the answer is:
branch
'subdivision' is the definition.
(I know that subdivision can be written as branch)
'stock farm at wembley central' is the wordplay.
'stock farm' becomes 'ranch' (I've seen this before).
'at' says to put letters next to each other (I've seen this in other clues).
'central' indicates the central letters.
The middle of 'wembley' is 'b'.
'ranch' put after 'b' is 'BRANCH'.
'of a' is the link.
(Other definitions for branch that I've seen before include "Offshoot, subsidiary part" , "Arm" , "Trunk offshoot" , "division within large organisation" , "Offshoot or subdivision" .)