### Clue: Happen to be right about anger following answer by Penny (9)
### Answer: TRANSPIRE 
 ### Explanation: Definition: Happen 
 **Reversal of**(… about) RT(abbrev. for "right") + {IRE(anger/rage) **placed after**(following ) [ANS(abbrev. for "answer") **plus**(by) P(abbrev. for "penny", the unit of British currency)]}.