Cryptic crossword clue
Completed fitting but not yet paid 7

The most common and most likely answer to this crossword clue is the 7 letter word OVERDUE

I've seen this crossword clue in The Daily Telegraph
O
V
E
R
D
U
E


Buddy explains!

The straight part
We know that "not yet paid" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not yet paid = overdue.
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 OVERDUE mean?

OVERDUE adjective
  1. Late; especially, past a deadline or too late to fulfill a need.

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