Don’t worry – haven’t been known to take amiss (5,4)
I believe the answer is:
never mind
'don't worry' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for never mind that I've seen before include "Don't worry" , "It doesn't matter" , "who cares?" , "Forget" .)