Offer more than (6)
I believe the answer is:
outbid
'offer more than' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for outbid that I've seen before include "But I do (anag)" , "as 14 might do to 3 or 26" , "Make a higher offer than another" , "Offer more than someone else" , "Offer more than a competitor at an auction" .)