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

The straight part
We know that "ingratiating" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ingratiating = obsequious.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
OBSEQUIOUS adjective- Obedient; compliant with someone else's orders or wishes.
- Excessively eager and attentive to please or to obey instructions; fawning, subservient, servile.
- Of or pertaining to obsequies, funereal.