### Clue: Amused expression inspired by 25 (2-2)
### Answer: HE-HE 
 ### Explanation: Definition: Amused expression
A hidden answer ('inspired by') in 'hot on t**HE HE**els of' ('25'). Since the expression is not actually part of the clue, the convention hardly applies that a hidden answer should not contain words not a part of the answer.