New nosh not in a mess (4)

I believe the answer is:

neat

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

'not in a mess' is the definition.
I can't judge whether this definition defines the answer.

'new nosh' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'nosh' becomes 'eat' (I've seen this in another clue).
'n'+'eat'='NEAT'

Can you help me to learn more?

(Other definitions for neat that I've seen before include "Orderly, uncluttered" , "Tidy - cool!" , "(Of alcohol) not diluted" , "bull, eg" , "without ice?" .)

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