A measure of money — coins not initially sufficient for good book (5)
I believe the answer is:
micah
'book' is the definition.
(I've seen this before)
'a measure of money coins not initially sufficient for good' is the wordplay.
I cannot quite understand how this works, but
'a' is found in the answer.
'measure' could be 'mi' (mi is a kind of measure) and 'mi' is found within the answer.
'money' could be 'c' and 'c' is found within the answer.
A single letter 'h' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
(Other definitions for micah that I've seen before include "Old Testament book" , "set of books" , "Bookmaker" , "Hebrew prophet; OT book" , "Old Testament prophet" .)