Cryptic crossword clue
With a gloss coat in autumn, museum’s overwhelmed by approval 9

The most common and most likely answer to this crossword clue is the 9 letter word ANNOTATED

A
N
N
O
T
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E
D

Buddy explains!

The straight part
We know that "With a gloss" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case with a gloss = annotated.
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 ANNOTATED mean?

ANNOTATED verb
  1. To add annotation to.
ANNOTATED adjective
  1. Contains or is accompanied by annotations or labelled notes.

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