The most common and most likely answer to this crossword clue is the 10 letter word PROGENITOR
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More clues leading to the result PROGENITOR
- Founder in port region, completely wrecked
- For information one has to run for parent
- One stands in for man or father
- Hack reporting about love for parent?
- Bemused prior to receiving the low-down from dad
- No amateur toff leading soldiers, one held to be a forefather
- Founder when one expert after another leaves us, having to recruit beginner
- One standing in for man or father
- Father, for good measure, organised riot
Buddy explains!

The straight part
We know that "forefather" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case forefather = progenitor.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 PROGENITOR mean?
PROGENITOR noun- A forefather, any of a person's direct ancestors.
- An individual from whom one or more people (dynasty, tribe, nation...) are descended.
- An ancestral form of a species.
- A predecessor of something, especially if also a precursor or model.
- Someone who originates something.
- A founder.