Broadly, open to offer odds at starting price (5)
I believe the answer is:
splay
'broadly open' is the definition.
'splay' can be an answer for 'open' (thesaurus). I'm not sure about the 'broadly' bit.
'odds at starting price' is the wordplay.
'odds' becomes 'sp' (betting abbreviation for starting price).
'at' says to put letters next to each other.
'starting price' becomes 'lay' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sp'+'lay'='SPLAY'
'to offer' is the link.
Can you help me to learn more?
(Other definitions for splay that I've seen before include "Slope" , "Spread outwards" , "Widely spread" , "Spread apart" .)