What does the cryptic crossword clue "In effect, we ensure bard's in the middle (5)" mean?

The definition is "bard’s in the middle". The wordplay uses a hidden word. Hidden in "in effecT, WE ENsure bard's in the middle" The answer is TWEEN.

In effect, we ensure bard's in the middle (5)

Guardian Cryptic #29125 | 22 Down | 2023-07-18 flower