Outbid at the last second, as on eBay (5)
I believe the answer is:
snipe
'outbid at the last second as on ebay' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for snipe that I've seen before include "Shoot from place of concealment" , "Perhaps carp" , "To pick off soldiers, say" , "Fire from cover; bird" , "river bird" .)