Sprinkle the last of the pepper in the hash (5)
I believe the answer is:
strew
'sprinkle' is the definition.
(I've seen this before)
'the last of the pepper in the hash' is the wordplay.
'the last of' says to take the final letters.
'in the' is an insertion indicator.
'hash' becomes 'stew' (I've seen this before).
The last letter of 'pepper' is 'r'.
'r' placed inside 'stew' is 'STREW'.
(Other definitions for strew that I've seen before include "Scatter loosely" , "Sprinkle" , "Scatter untidily" , "Scatter, spread around" .)