Cryptic crossword clue
Greek ace seeing sweetheart changing imperceptibly 9

The most common and most likely answer to this crossword clue is the 9 letter word GRADATING

G
R
A
D
A
T
I
N
G

Buddy explains!

The straight part
We know that "changing imperceptibly" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case changing imperceptibly = gradating.
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 GRADATING mean?

GRADATING verb
  1. To change imperceptibly from one gradation of tone etc. to another.
  2. To arrange in order of grades.
  3. To bring to a certain strength or grade of concentration.

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