The most common and most likely answer to this crossword clue is the 5 letter word AUNTY
A
U
N
T
Y
Buddy explains!
The straight part
We know that "relation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case relation = aunty.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 AUNTY mean?
AUNTY noun- The sister or sister-in-law of one’s parent.
- The female cousin of one’s parent.
- A woman of an older generation than oneself, especially a friend of one's parents, by means of fictive kin.
- Any elderly woman.
- A procuress or bawd.
- Term of familiarity or respect for a middle-aged or elderly woman.