The most common and most likely answer to this crossword clue is the 6 letter word AFFAIR
A
F
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More clues leading to the result AFFAIR
- A fine considerably limits current liaison
- A decent-sounding business
- A pair of females ventilate business
- . Fling nothing skywards – OK?
- Nothing’s flipping free from dishonesty in business
- Business in a trade show announced
- Fling with fellow in a travelling show
- Happening just after footballers turned up
- Event is a fine opportunity to have fun
- Answer following reasonable concern
Buddy explains!

The straight part
We know that "relationship" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case relationship = affair.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 AFFAIR mean?
AFFAIR noun- (often in the plural) Something which is done or is to be done; business of any kind, commercial, professional, or public.
- Any proceeding or action which it is wished to refer to or characterize vaguely.
- An action or engagement not of sufficient magnitude to be called a battle.
- A material object (vaguely designated).
- An adulterous relationship. (from affaire de cœur).
- A romantic relationship with someone who is not one's regular partner (boyfriend, girlfriend).
- A person with whom someone has an adulterous relationship.
- A party or social gathering, especially of a formal nature.
- The (male or female) genitals.