Proclaim part of speech in English church (7)
I believe the answer is:
enounce
'proclaim' is the definition.
(I've seen this before)
'part of speech in english church' is the wordplay.
'part of speech' becomes 'noun' (noun is a kind of part of speech).
'in' means one lot of letters goes inside another.
'english' becomes 'e' (abbreviation).
'church' becomes 'ce' (abbreviation for Church of England).
'e'+'ce'='ece'
'noun' inserted inside 'ece' is 'ENOUNCE'.
(Other definitions for enounce that I've seen before include "Utter" , "Proclaim; articulate" , "say" , "State clearly" , "Formally articulate" .)