The most common and most likely answer to this crossword clue is the 4 plus 6 letter word FINE TUNING
I've seen this crossword clue in Independent
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Buddy explains!
The straight part
We know that "making slight adjustments" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case making slight adjustments = fine tuning.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 FINE TUNING mean?
FINE TUNING verb- To make small adjustments to (something) until it is optimal.