Sound of phone ultimately jarring during start of religious chant (8)
I believe the answer is:
ringtone
'sound of phone' is the definition.
'ringtone' can be an answer for 'sound' (I have seen 'Mobile sound ' mean 'ringtone' so perhaps 'sound' could also mean 'ringtone'). I'm not certain of the 'of phone' bit.
'ultimately jarring during start of religious chant' is the wordplay.
'ultimately' says to take the final letters.
'during' is an insertion indicator.
'start of' says to take the initial letters.
'chant' becomes 'intone' (synonyms).
The last letter of 'jarring' is 'g'.
The first letter of 'religious' is 'r'.
'r'+'intone'='rintone'
'g' going inside 'rintone' is 'RINGTONE'.
Can you help me to learn more?
(Other definitions for ringtone that I've seen before include "Sound heard when someone telephones" , "Sound coming from mobile" , "Sound of modern life" , "Nitrogen (anag.)" , "Sound made by a mobile phone" .)