Cry out, seeing loose weathered stones on front of church (7)
I believe the answer is:
screech
'cry out' is the definition.
'loose weathered stones on front of church' is the wordplay.
'loose weathered stones' becomes 'scree' (scree refers to a mass of loose stones).
'on front of' says to put letters next to each other.
'church' becomes 'ch' (common abbreviation).
'scree'+'ch'='SCREECH'
'seeing' acts as a link.
(Other definitions for screech that I've seen before include "Outcry" , "Squeal" , "cry of horror" , "Cry raucously; type of owl" , "Sharp piercing cry" .)