What does the cryptic crossword clue "Perfect backside a lad is concealing (5)" mean?

The definition is "Perfect". The wordplay uses a hidden word. Hidden in "perfect backsIDE A Lad is concealing" The answer is IDEAL.

Perfect backside a lad is concealing (5)

Guardian Cryptic #29377 | 23 Across | 2024-05-08 flower