Work out with hellish new gangster away (5)
I believe the answer is:
infer
'work out' is the definition.
(I know that infer is a kind of the work out)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for infer that I've seen before include "Imply" , "Take finer meaning from" , "Deduce, surmise" , "Read between the line" , "Conclude by reasoning" .)