What does the cryptic crossword clue "Undertaking is accepted by Age Concern after revision (12)" mean?

The wordplay uses an anagram. anagram of IS + AGE + CONCERN = RECOGNISANCE The answer is RECOGNISANCE.

Undertaking is accepted by Age Concern after revision (12)

Daily Mail Cryptic #16902 | 29 Across | 2022-08-15 flower