Boar free after battering ancestor (8)

I believe the answer is:

forebear

I'm a little stuck... Click here to teach me more about this clue!

'ancestor' is the definition.
(I know that ancestor can be written as forebear)

'boar free after battering' is the wordplay.
'boar free' anagrams to 'FOREBEAR'.
However, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for forebear that I've seen before include "predecessor?" , "Ancestor" , "one from the past" , "One of an earlier generation" , "Older relative" .)

I've seen this clue in The Sun.

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