The most common and most likely answer to this crossword clue is the 10 letter word FLOURISHED
I've seen this crossword clue in The Times
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More clues leading to the result FLOURISHED
Buddy explains!

The straight part
We know that "Was blooming" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case was blooming = flourished.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.
Crossword Answer definitions
FLOURISHED verb- To thrive or grow well.
- To prosper or fare well.
- To be in a period of greatest influence.
- To develop; to make thrive; to expand.
- To make bold, sweeping movements with.
- To make bold and sweeping, fanciful, or wanton movements, by way of ornament, parade, bravado, etc.; to play with fantastic and irregular motion.
- To use florid language; to indulge in rhetorical figures and lofty expressions.
- To make ornamental strokes with the pen; to write graceful, decorative figures.
- To adorn with beautiful figures or rhetoric; to ornament with anything showy; to embellish.
- To execute an irregular or fanciful strain of music, by way of ornament or prelude.
- To boast; to vaunt; to brag.
- Decorated with flourishes.