Best friends with edgy bassists playing very loudly inside (4)

I believe the answer is:

bffs

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'best friends' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'edgy bassists playing very loudly inside' is the wordplay.
'edgy bassists playing' becomes 'bs' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'very loudly' becomes 'ff' (short for fortissimo, 'very loud' in music).
'inside' is an insertion indicator.
'bs' placed around 'ff' is 'BFFS'.

'with' is the link.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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