Price of round, capacious cups? (4)
'price' is the definition.
(I've seen this before)
'round capacious cups?' is the wordplay.
'round' becomes 'o' (round can mean a round object).
'capacious cups?' becomes 'DDs' (DD bra size).
'of' acts as a link.
(Other definitions for odds that I've seen before include "prices", "Bookies give them", "Indicator of likely betting winnings", "Things not even", "Chance".)