Crazy types. Ones who work alone (7)
I believe the answer is:
hatters
'crazy types' is the definition.
The answer and definition can be both people as well as being plural nouns.
Perhaps there's an association between them I don't understand?
'ones who work alone' is the wordplay.
I cannot really understand how this works, but
'work' could be 'hat' (hat is a kind of work) and 'hat' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for hatters that I've seen before include "Milliners" , "Headgear manufacturers" .)