The most common and most likely answer to this crossword clue is the 7 letter word ANALYSE
I've seen this crossword clue in The Sunday Telegraph
A
N
A
L
Y
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E
More clues leading to the result ANALYSE
- Girl is deceitful, we hear -- examine closely
- Break down in twisting lane, say
- A new drink? Yes, being oddly imbibed in test
- Inspect any ales drunk
- Make a detailed study of changing lane, say
- Carefully examine any seal that’s been tampered with
- What psychiatrists do in a sane lady’s case is crazy
- Break down changing lane, say
- The girl isn’t honest? Hearing this, break down
- Girl fibs, heard judge
Buddy explains!

The straight part
We know that "Make a detailed study of" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case make a detailed study of = analyse.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 ANALYSE mean?
ANALYSE verb- To subject to analysis.
- To resolve (anything complex) into its elements.
- To separate into the constituent parts, for the purpose of an examination of each separately.
- To examine in such a manner as to ascertain the elements or nature of the thing examined; as, to analyze a fossil substance, to analyze a sentence or a word, or to analyze an action to ascertain its morality.