Move around bottom pasture (9)
I believe the answer is:
rearrange
'move around' is the definition.
(I've seen this before)
'bottom pasture' is the wordplay.
'bottom' becomes 'rear' ('rear' can be a synonym of 'bottom').
'pasture' becomes 'range' ('range' can be a synonym of 'pasture').
'rear'+'range'='REARRANGE'
(Other definitions for rearrange that I've seen before include "Move round" , "Put in new order" , "Order differently" , "Move to new positions" , "Move around" .)