The most common and most likely answer to this crossword clue is the 14 letter word SPICK-AND-SPAN
S
P
I
C
K
-
A
N
D
-
S
P
A
N
Buddy explains!
The straight part
We know that "Neat" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case neat = spick-and-span.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SPICK-AND-SPAN mean?
SPICK-AND-SPAN adjective- Clean, spotless; original sense “like new”.