The most common and most likely answer to this crossword clue is the 8 letter word PROFOUND
I've seen this crossword clue in The Times
P
R
O
F
O
U
N
D
More clues leading to the result PROFOUND
- Far-reaching, expert discovered
- Learned being in favour of institute
- Intellectually deep academic certain to release book
- Demanding deep thought, expert discovered
- Extensive supporting cast
- Expert to start showing great insight
- Weighty Trump’s ultimate gold-backed money supply contains zilch
- Expert discovered to have great insight
- Demanding deep thought, professional discovered
- Great and favourable point discovered
Buddy explains!

The straight part
We know that "Learned" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case learned = profound.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 PROFOUND mean?
PROFOUND noun- The deep; the sea; the ocean.
- An abyss.
- To cause to sink deeply; to cause to dive or penetrate far down.
- To dive deeply; to penetrate.
- Descending far below the surface; opening or reaching to great depth; deep.
- Very deep; very serious
- Intellectually deep; entering far into subjects; reaching to the bottom of a matter, or of a branch of learning; thorough
- Characterized by intensity; deeply felt; pervading
- Bending low, exhibiting or expressing deep humility; lowly; submissive