The most common and most likely answer to this crossword clue is the 6 letter word SUITED
I've seen this crossword clue in The Daily Telegraph
S
U
I
T
E
D
Buddy explains!

The straight part
We know that "Qualified" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case qualified = suited.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 SUITED mean?
SUITED verb- To make proper or suitable; to adapt or fit.
- (said of clothes, hairstyle or other fashion item) To be suitable or apt for one's image.
- To be appropriate or apt for.
- (most commonly used in the passive form) To dress; to clothe.
- To please; to make content; to fit one's taste.
- To agree; to be fitted; to correspond (usually followed by to, archaically also followed by with)
- (of two or more cards) Of the same suit.