The most common and most likely answer to this crossword clue is the 13 letter word YUKATA/IMAGER
Y
U
K
A
T
A
/
I
M
A
G
E
R
Buddy explains!
The straight part
We know that "light coat/one records pictures" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case light coat/one records pictures = yukata/imager.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.