The most common and most likely answer to this crossword clue is the 7 letter word STUDIED
I've seen this crossword clue in The Guardian
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More clues leading to the result STUDIED
Buddy explains!

The straight part
We know that "Read/without spontaneity" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case read/without spontaneity = studied.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 STUDIED mean?
STUDIED adjective- Practiced; self-conscious; careful.
- Qualified by, or versed in, study; learned.
- (usually academic) To review materials already learned in order to make sure one does not forget them, usually in preparation for an examination.
- (academic) To take a course or courses on a subject.
- To acquire knowledge on a subject with the intention of applying it in practice.
- To look at minutely.
- To fix the mind closely upon a subject; to dwell upon anything in thought; to muse; to ponder.
- To endeavor diligently; to be zealous.