Spread last bit of sour pickle around (5)
I believe the answer is:
strew
'spread' is the definition.
(to strew is to spread or scatter around)
'last bit of sour pickle around' is the wordplay.
'last bit of' says to take the final letters.
'pickle' becomes 'stew' (both can mean a difficult situation).
'around' means one lot of letters goes inside another.
The final letter of 'sour' is 'r'.
'r' going inside 'stew' is 'STREW'.
(Other definitions for strew that I've seen before include "Scatter, spread around" , "Sprinkle" , "Scatter loosely" , "Scatter untidily" .)