The most common and most likely answer to this crossword clue is the 5 letter word CARED
I've seen this crossword clue in Financial Times
C
A
R
E
D
More clues leading to the result CARED
Buddy explains!

The straight part
We know that "Was anxious" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case was anxious = cared.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 CARED mean?
CARED verb- To be concerned (about), to have an interest (in); to feel concern (about).
- (polite) To want, to desire; to like; to be inclined towards.
- (with for) To look after or look out for.
- To mind; to object.