Holler when rocky debris dumped by church (7)
I believe the answer is:
screech
'holler' is the definition.
(I know that screech is a more specific form of the action holler)
'rocky debris dumped by church' is the wordplay.
I cannot really see how this works, but
'church' could be 'ch' (abbreviation on maps etc) and 'ch' is found within the answer.
'rocky debris' could be 'scree' (I've seen this in another clue) and 'scree' is located in the answer.
No letters remain.
This explanation may well be incorrect...
'when' is the link.
Can you help me to learn more?
(Other definitions for screech that I've seen before include "Sharp piercing cry" , "Sudden shrill cry" , "Harsh piercing cry" , "Terrifying sound" , "cry of horror" .)