Wasn't mad about type of string sounds from banjo, maybe (6)

I believe the answer is:

twangs

I'm a little stuck... Click here to teach me more about this clue!

'string sounds from banjo maybe' is the definition.
I can't tell whether this defines the answer.

'wasn't mad about type' is the wordplay.
'mad' is an anagram indicator.
'about' indicates putting letters inside.
'type' becomes 'g' (I can't justify this - if you can you should believe this answer much more).
'wasnt' with letters rearranged gives 'twans'.
'twans' placed around 'g' is 'TWANGS'.

'of' acts as a link.

Can you help me to learn more?

(Another definition for twangs that I've seen is " Sharp vibrating sounds".)

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.