The most common and most likely answer to this crossword clue is the 7 letter word NOTATED
I've seen this crossword clue in The Daily Telegraph
N
O
T
A
T
E
D
More clues leading to the result NOTATED
- Added comments to approving gesture when touring gallery
- Maybe a conventional fifties-style fellow given symbolic representation
- Scored at last then went around with no top on
- New date not written in series of symbols
- Scored having picked up fellow outside gallery
- Recorded music?
- Marked down as no fan of one 50’s cult
- No place for art, direct header scored
- Academic set up outside gallery and wrote music
- Written using symbols -- indefinite number to date misinterpreted?
Buddy explains!

The straight part
We know that "Written using symbols" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case written using symbols = notated.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 NOTATED mean?
NOTATED verb- To mark with spots or lines, which are often colored.
- To add notes to; to annotate
- To create notation (i.e. music); to record/put down in the form of notation