The most common and most likely answer to this crossword clue is the 7 letter word SPOTLIT
I've seen this crossword clue in The Sunday Telegraph
S
P
O
T
L
I
T
More clues leading to the result SPOTLIT
- Notice books in the 19?
- Drug seen in fissure is made the centre of attention
- List operations going the wrong way, easily seen in theatre
- Put the focus on narrow opening full of grass
- Landed on mark that’s clearly visible on stage
- See writing brilliantly presented on the stage
- Amid schism, Old Testament is given prominence
Buddy explains!

The straight part
We know that "easily seen in theatre" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case easily seen in theatre = spotlit.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 SPOTLIT mean?
SPOTLIT verb- To illuminate with a spotlight.
- To draw attention to.