The most common and most likely answer to this crossword clue is the 13 letter word DISPASSIONATE
I've seen this crossword clue in Independent
D
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P
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More clues leading to the result DISPASSIONATE
- Unemotional lives go by, one likely to interrupt romantic meeting
- Changing pants idea is so cool
- As a despot I sin, somehow showing no emotion
- Dicky posits an idea about opening of summer fair
- Fancy set with “Adios Spain” as objective?
- Unusually poised as saint, showing no emotion
- … changing pants, idea is so cool
- Objective is emotion filling court
- Is success in exam ahead of one consumed by present objective?
Buddy explains!

The straight part
We know that "fair" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fair = dispassionate.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 DISPASSIONATE mean?
DISPASSIONATE adjective- Not showing, and not affected by, emotion, bias, or prejudice