The most common and most likely answer to this crossword clue is the 7 letter word STATICS
I've seen this crossword clue in The Daily Telegraph
S
T
A
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More clues leading to the result STATICS
Buddy explains!

The straight part
We know that "Science needing a balanced approach?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case science needing a balanced approach? = statics.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 STATICS mean?
STATICS noun- The branch of mechanics concerned with forces in static equilibrium