Lay odds or evens in two angles. Right? (5)
I believe the answer is:
wager
'lay' is the definition.
(thesaurus)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for wager that I've seen before include "better to put this on?" , "Bet, gamble" , "Risk; stake" , "act for "The Gamblers"?" , "(Place a) stake" .)