Offer some dumb ideas! (3)
I believe the answer is:
bid
'offer' is the definition.
('bid' can be a synonym of 'offer')
'some dumb ideas' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'BID' is hidden within 'dumb ideas'.
(Other definitions for bid that I've seen before include "Order - offer" , "Offer; command" , "Offer a sum of money to buy" , "Propose a payment" , "Sum offered at an auction" .)