Working to offload second purchase (3)
I believe the answer is:
buy
'purchase' is the definition.
(buy is a kind of purchase)
'working to offload second' is the wordplay.
'working' becomes 'busy'.
'to offload' is a deletion indicator.
'second' becomes 's' (common abbreviation).
'busy' with 's' taken out is 'BUY'.
(Other definitions for buy that I've seen before include "Get" , "Purchase" , "Accept truth of (colloq.)" , "Procure" .)