### Clue: Two-legged beast's tender boxing exercises? (5)
### Answer: BIPED 
 ### Explanation: Definition: Two-legged beast
  BID(tender,an offer,a quotation) **containing**(boxing) PE($$p$$hysical $$e$$xercises)
Defn:  An animal,beast with two feet, but I guess two legs qualifies as well.