Hardly anything mostly coin-operated worked with hand (1,4,2,3,5)
I believe the answer is:
a drop in the ocean
'hardly anything' is the definition.
(very small amount)
'mostly coin-operated worked with hand' is the wordplay.
'mostly' means to remove the last letter (most but not all of the word).
'worked with' indicates anagramming the letters.
'coin'+'operated'='coinoperated'
'coinoperated' with its last letter taken off is 'coinoperate'.
'coinoperate' anagrammed with 'hand' gives 'A DROP IN THE OCEAN'.
(Other definitions for a drop in the ocean that I've seen before include "Splashdown" , "A fall in sea level" , "An Arctic plunge" , "Making minimal impact" , "going with the tide?" .)