The most common and most likely answer to this crossword clue is the 4 plus 2 plus 4 plus 4 letter word TAKE IN GOOD PART
I've seen this crossword clue in The Daily Telegraph
T
A
K
E
I
N
G
O
O
D
P
A
R
T
More clues leading to the result TAKE IN GOOD PART
Buddy explains!
The straight part
We know that "Respond amiably" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case respond amiably = take in good part.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.