Very last trade (4)
I believe the answer is:
vend
'trade' is the definition.
(I've seen this before)
'very last' is the wordplay.
'very' becomes 'v' (abbreviation).
'last' becomes 'end'.
'v'+'end'='VEND'
(Other definitions for vend that I've seen before include "Peddle" , "Sell" , "trade" , "Offer for sale" .)