Comprehensive term for a brasshat (7)

I believe the answer is:

general

I'm a little stuck... Click here to teach me more about this clue!

'comprehensive' is the definition.
(general can mean comprehensive or universal)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for general that I've seen before include "Not specialised, like army chief" , "Not specialised, rank" , "High ranking soldier" , "Enlarge (anag.)" , "Not specialised or limited" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app