What does the cryptic crossword clue "It's often inserted in error, perhaps too inanely (10)" mean?

The wordplay uses a container (one word inside another). anagram of PERHAPS TOO = APOSTROPHE The answer is APOSTROPHE.

It's often inserted in error, perhaps too inanely (10)

Guardian Cryptic #29292 | 23 Across | 2024-01-30 flower