The most common and most likely answer to this crossword clue is the 4 letter word ABBA
A
B
B
A
More clues leading to the result ABBA
- Group of rhymes in Petrarchan sonnet
- Father’s unchanged after returning
- Reversible camel-hair coat
- Songwriters using enclosed rhyme scheme
- Members of Black Sabbath joined famous group
- Part of sabbatical group
- Quartet‘s initial scheme for 2, perhaps
- . Either way he’s Jesus’ father
- A big brown alligator heads for group of 13
- They made ‘SOS’ a palindrome
Buddy explains!

The straight part
We know that "Father" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case father = abba.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 ABBA mean?
ABBA noun- Father; religious superior; in the Syriac, Coptic, and Ethiopic churches, a title given to the bishops, and by the bishops to the patriarch; a title given to Jewish scholars in the Talmudic period.
- A coarse, often striped, felted fabric from the Middle East, woven from goat or camel hair.
- A loose-fitting sleeveless garment, made from aba or silk, worn by Arabs.
- An outer garment made of the above, very simple in form, worn by the Arabs of the desert. The illustration shows such an aba, made of two breadths of stuff sewed together to make an oblong about four by nine feet.