What does the cryptic crossword clue "Old store of brine that fermented (5,4)" mean?

The definition is "Old store". The wordplay uses an anagram. anagram of BRINE THAT = TITHEBARN The answer is TITHEBARN.

Old store of brine that fermented (5,4)

Guardian Cryptic #29143 | 11 Across | 2023-08-08 flower