Fool accepted inside jobs were a dime a dozen (3-3)
I believe the answer is:
two-bit
'were a dime a dozen' is the definition.
I can't judge whether this definition defines the answer.
'fool accepted inside jobs' is the wordplay.
'fool' becomes 'twit' (both can mean a stupid person).
'accepted' is an insertion indicator.
'inside' says to take the centre.
The centre of 'jobs' is 'ob'.
'twit' going around 'ob' is 'TWO-BIT'.
Can you help me to learn more?
(Other definitions for two-bit that I've seen before include "Cheap - insignificant" , "Inferior - cheap" , "Paltry" , "Cheap (US colloq.)" , "Cheap, worthless (US)" .)