A Monet ultimately attracts bids (8)
I believe the answer is:
attempts
'bids' is the definition.
(I've seen this in another clue)
'a monet ultimately attracts' is the wordplay.
'ultimately' indicates one should take the final letters.
'attracts' becomes 'tempts' (tempt can mean to attract).
The final letter of 'monet' is 't'.
'a'+'t'+'tempts'='ATTEMPTS'
(Other definitions for attempts that I've seen before include "Endeavours, tries" , "Makes efforts" , "Takes a shot" , "Tries, makes an effort" , "Has a go at" .)