Each smartphone download potentially interrupted by ring (1,3)
I believe the answer is:
a pop
'each' is the definition.
(eg 'one pound a pop' can mean 'one pound each')
'smartphone download potentially interrupted by ring' is the wordplay.
I cannot quite see how this works, but
'ring' could be 'o' (letter resembling a ring) and 'o' is present in the answer.
'download' could be 'app' (phone or computer application) and 'app' is found within the remaining letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for a pop that I've seen before include "What an orphan might wish for" , "individually" .)