Like the dollar one might bet for a seat? (6)
I believe the answer is:
bottom
'a seat?' is the definition.
('bottom' can be a synonym of 'seat')
'like the dollar one might bet for' is the wordplay.
I cannot quite see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for bottom that I've seen before include "mechanic, for instance" , "Shakespearean - rear" , "one of Shakespeare's comic characters" , "Athenian weaver (AMND)" , "Weaver < 's backside" .)