Bit of work in unusual book (3,3)
I believe the answer is:
odd job
'bit of work' is the definition.
'odd job' can be an answer for 'work' (I have seen 'Casual work' mean 'odd job' so perhaps 'work' could also mean 'odd job'). I'm not sure about the 'bit of' bit.
'unusual book' is the wordplay.
'unusual' becomes 'odd' (similar in meaning).
'book' becomes 'Job' (book of the Bible).
'odd'+'job'='ODD-JOB'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for odd job that I've seen before include "little work" , "Casual piece of work" , "villainous sidekick" , "Casual work (for Goldfinger's minder?)" , "Part-time" .)