The most common and most likely answer to this crossword clue is the 6 letter word BEGETS
B
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More clues leading to the result BEGETS
Buddy explains!

The straight part
We know that "Fathers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fathers = begets.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 BEGETS mean?
BEGETS verb- To father; to sire; to produce (a child).
- To cause; to produce.
- To bring forth.
- To happen to; befall.