A priest in lowly accommodation's given form (6)
I believe the answer is:
shaped
'given form' is the definition.
(I've seen this before)
'a priest in lowly accommodation's' is the wordplay.
'priest' becomes 'p' (ecclesiastical abbreviation).
'in' is an insertion indicator.
'lowly accommodation' becomes 'shed' (I am not sure about this - if you are sure you should believe this answer much more).
'a'+'p'='ap'
'ap' put into 'shed' is 'SHAPED'.
Can you help me to learn more?
(Other definitions for shaped that I've seen before include "Formed or fashioned" , "modelled" , "Gave form to" , "Cast or moulded" , "Form-filling" .)