Scotsman had to bag trash in cleric's office (9)
I believe the answer is:
rabbinate
'office' is the definition.
(I know that rabbinate is a type of office)
'scotsman had to bag trash in cleric's' is the wordplay.
'scotsman' becomes 'Rab' (Rab is a Scottish name).
'had' becomes 'ate' ('have' can mean 'eat').
'to bag' means one lot of letters goes inside another.
'trash in cleric's' becomes 'bin' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'rab'+'ate'='rabate'
'rabate' placed around 'bin' is 'RABBINATE'.
Can you help me to learn more?
(Other definitions for rabbinate that I've seen before include "collection of teachers" , "Jewish religious office" , "Jewish master' s tenure" .)