The most common and most likely answer to this crossword clue is the 7 letter word OUTWITS
I've seen this crossword clue in Financial Times
O
U
T
W
I
T
S
More clues leading to the result OUTWITS
Buddy explains!
The straight part
We know that "Is too smart for" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case is too smart for = outwits.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 OUTWITS mean?
OUTWITS verb- To get the better of; to outsmart, to beat in a competition of wits.