Eccentric urged to interrupt boring toil (8)
I believe the answer is:
drudgery
'toil' is the definition.
(I know that drudgery is a type of toil)
'eccentric urged to interrupt boring' is the wordplay.
'eccentric' indicates an anagram.
'to interrupt' is an insertion indicator.
'boring' becomes 'dry' (dry can mean dull or boring).
'urged' with letters rearranged gives 'udger'.
'udger' placed into 'dry' is 'DRUDGERY'.
(Other definitions for drudgery that I've seen before include "Grind" , "Hard monotonous donkeywork" , "monotonous work" , "Menial hard work" , "Boring hard work" .)