The most common and most likely answer to this crossword clue is the 9 letter word INTENSIFY
I've seen this crossword clue in Financial Times
I
N
T
E
N
S
I
F
Y
More clues leading to the result INTENSIFY
- How decades are arranged if years hot up
- Fashionable decades provided unknown boost
- Female inside is ninety struggling for fuel
- Concentrate when dealing with decimals if unknown quantity
- Means to let daughter go out provided you initially pick up
- Strengthen fine wines, ultimately breaking tiny rum bottles
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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 INTENSIFY mean?
INTENSIFY verb- To render more intense
- To become intense, or more intense; to act with increasing power or energy.