Mufti's cryptically welcoming bishop with quiet greeting (4,4)

'greeting' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'mufti's cryptically welcoming bishop with quiet' is the wordplay.
'cryptically' is an anagram indicator.
'welcoming' means one lot of letters goes inside another (in sense of 'inviting in').
'bishop' becomes 'b' (abbreviation for bishop in chess).
'with' means one lot of letters go next to another.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'muftis' is an anagram of 'fistum'.
'fistum' placed around 'b' is 'fistbum'.
'fistbum'+'p'='FIST BUMP'

Can you help me to learn more?