Angels start to spend time with that man keeping quiet (8)
I believe the answer is:
seraphim
'angels start to spend time with that man keeping quiet' is the definition.
'seraphim' can be an answer for 'angels' (I've seen this before). I'm not certain of the remainder of the definition.
'time with that man keeping quiet' is the wordplay.
'time with' becomes 'sera' (I can't justify this - if you can you should give a lot more credence to this answer).
'that man' becomes 'him' (I've seen this before).
'keeping' means one lot of letters goes inside another.
'quiet' becomes 'p' (music symbol for 'piano').
'sera'+'him'='serahim'
'serahim' going around 'p' is 'SERAPHIM'.
Can you help me to learn more?
(Other definitions for seraphim that I've seen before include "High-ranking angels" , "High spirits" , "Angelic types" , "Angelic beings" , "Angels of the highest rank" .)