Each donation pre-distribution is miniscule (1,4,2,3,5)
I believe the answer is:
a drop in the ocean
'miniscule' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'each donation pre-distribution' is the wordplay.
'distribution' indicates an anagram.
'each'+'donation'+'pre'='eachdonationpre'
'eachdonationpre' anagrammed gives 'A DROP IN THE OCEAN'.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for a drop in the ocean that I've seen before include "It'll have no great effect" , "result of walking the plank?" , "Splashdown" , "Certainly no effect of global warming" , "An Arctic plunge" .)