Old men part with a set of books? Outrageous! (10)
I believe the answer is:
exorbitant
'outrageous' is the definition.
('exorbitant' can be a synonym of 'outrageous')
'old men part with a set of books?' is the wordplay.
'old' becomes 'ex'.
'men' becomes 'or' (I've seen this in other clues).
'part with' becomes 'bit' (bit is a kind of part. I am not sure about the 'with' bit.**).
'a set of books?' becomes 'ant'.
'ex'+'or'+'bit'+'ant'='EXORBITANT'
Can you help me to learn more?
(Other definitions for exorbitant that I've seen before include "Unreasonable" , "Very dear" , "going beyond the limits?" , "Exceeding the bounds of reason" , "overpriced" .)