The most common and most likely answer to this crossword clue is the 8 letter word TWEAKING
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Buddy explains!

The straight part
We know that "making finer adjustments" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case making finer adjustments = tweaking.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 TWEAKING mean?
TWEAKING verb- To pinch and pull with a sudden jerk and twist; to twitch.
- To adjust slightly; to fine-tune.
- To twit or tease.
- To abuse methamphetamines, especially crystal meth.
- To exhibit symptoms of methamphetamine abuse, such as extreme nervousness, compulsiveness, erratic motion, excitability; possibly a blend of twitch and freak.
- To exhibit extreme nervousness, evasiveness when confronted by law enforcement or other authority (e.g., customs agents, border patrol, teacher, etc.), mimicking methamphetamine abuse symptoms.
- A tweak; a minor modification.