Clue: Bridge odds on two queens (7)
Answer: SPANNER
Explanation: Definition: Bridge
 SP(abbrev. for "starting prices", indicating the odds of winning in a horse race) **plus**(on) [ ANNE(English queen once) + R(abbrev. for "Regina"/Queen) ](two queens).
Defn: A structure that bridges/spans across, say, a river, valley, gorge:
… or canal even: