### Clue: I make careless mistake in feeble poem, after change of heart (8)
### Answer: PALINODE 
 ### Explanation: Definition: poem, after change of heart
I NOD (make careless mistakes) in PALE. A palinode is " an ode in which the writer retracts a view or sentiment expressed in an earlier poem." A new word to me, justified by its use in the theme.