Padre mad to host a procession (6)
I believe the answer is:
parade
'procession' is the definition.
(I know that parade is a type of procession)
'padre mad to host a' is the wordplay.
'mad' is an anagram indicator.
'to host' means one lot of letters goes inside another (inserted letters are hosted or welcomed).
'padre' anagrammed gives 'parde'.
'parde' placed around 'a' is 'PARADE'.
(Other definitions for parade that I've seen before include "Show (put on by soldiers?)" , "Public procession or ceremonial march" , "exhibition" , "Assembly of troops for inspection" , "March past" .)