### Clue: Exhaust horse during show (6)
### Answer: BEGGAR 
 ### Explanation: Definition: Exhaust
 GG(or gee-gee/a horse in children's or colloquial speech) **contained in**(during) BEAR(to show/to display, as in "to bear the team's colours".
Defn: …/deplete, say, the resources of someone until he/she becomes as impoverished as a beggar.