The most common and most likely answer to this crossword clue is the 3 letter word DAD
I've seen this crossword clue in The Guardian
D
A
D
More clues leading to the result DAD
- Pop this way and that
- Edward oddly missing out as member of family
- Parents host TV show
- Lawyer, first to defend 19 across
- Pop band at last on bill
- Adult with two 14s around?
- A doctor’s round for relative
- Pop voice hosting jolly TV series
- Theologian embracing a member of the family
- Show how ‘pasta’ could be clued?
Buddy explains!

The straight part
We know that "relative" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case relative = dad.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 DAD mean?
DAD noun- A father, a male parent.
- (familiar) Used to address one's father
- Used to address an older adult male
- A lump or piece.
- A blow; act of striking something.
- To throw against something; to dash.