Squeal emerging from loose rocks by church (7)
I believe the answer is:
screech
'squeal' is the definition.
(I've seen this before)
'loose rocks by church' is the wordplay.
'loose rocks' becomes 'scree' (scree is a mass of loose rocks on a mountain).
'by' is a charade indicator (letters next to each other).
'church' becomes 'ch' (common abbreviation).
'scree'+'ch'='SCREECH'
'emerging from' is the link.
(Other definitions for screech that I've seen before include "Sharp piercing cry" , "Loud shrill cry" , "Yell" , "Raucous sound" , "Squawk" .)