Offer more than is available, then wait endlessly (6)
I believe the answer is:
outbid
'offer more than' is the definition.
(I've seen this before)
'available then wait endlessly' is the wordplay.
'available' becomes 'out' (I've seen this in other clues).
'then' is a charade indicator (letters next to each other).
'wait' becomes 'bide' (I've seen this before).
'endlessly' means to remove the last letter.
'bide' with its final letter taken off is 'bid'.
'out'+'bid'='OUTBID'
'is' acts as a link.
(Other definitions for outbid that I've seen before include "But I do (anag)" , "Offer more than a competitor at an auction" , "Make a higher offer than another" , "Offer more than someone else" , "Offer more for something than (another person)" .)