What does the cryptic crossword clue "To a shopper, oddly enough, it may indicate possession (10)" mean?

The wordplay uses an anagram. anagram of TO A SHOPPER = APOSTROPHE The answer is APOSTROPHE.

To a shopper, oddly enough, it may indicate possession (10)

Guardian Cryptic #25215 | 3 Down | 2011-01-10 flower