Cryptic crossword clue
Observant legatee, say, turning head on parking 10

The most common and most likely answer to this crossword clue is the 10 letter word PERCIPIENT

I've seen this crossword clue in The Guardian
P
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Buddy explains!

The straight part
We know that "Observant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case observant = percipient.
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

PERCIPIENT noun
  1. One who perceives something.
  2. One who has perceived a paranormal event.
PERCIPIENT adjective
  1. Having the ability to perceive, especially to perceive quickly.
  2. Perceiving events only in the moment, without reflection, as a very young child.

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