Endless calm around setter up for a bit of setting (5,3)
I believe the answer is:
place mat
'a bit of setting' is the definition.
(a place mat might be part of a table setting)
'endless calm around setter up' is the wordplay.
'endless' means to remove the last letter.
'calm' becomes 'placate' (to placate someone is to calm or relax them).
'around' means one lot of letters goes inside another.
'setter up' becomes 'em' (I am not sure about this - if you are sure you should believe this answer much more).
'placate' with its last letter taken off is 'placat'.
'placat' enclosing 'em' is 'PLACE-MAT'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for place mat that I've seen before include "base for drink?" , "It's used to protect the table" , "Table setting" , "It's put under a plate" , "Table protector" .)