Shabby doctor with the neat ensemble (9)

I believe the answer is:

motheaten

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

'shabby' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'doctor with the neat ensemble' is the wordplay.
'doctor' becomes 'mo' (medical officer).
'with' indicates putting letters inside.
'ensemble' indicates an anagram.
'neat' anagrammed gives 'aten'.
'the' placed within 'aten' is 'theaten'.
'mo'+'theaten'='MOTHEATEN'

Can you help me to learn more?

(Another definition for motheaten that I've seen is " Looking shabby".)

I've seen this clue in The Daily Express.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.