The most common and most likely answer to this crossword clue is the 4 plus 2 plus 5 letter word DOWN TO EARTH
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Buddy explains!
The straight part
We know that "Realistic" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case realistic = down to earth.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 DOWN TO EARTH mean?
DOWN TO EARTH adjective- Practical; realistic; pragmatic.