What does the cryptic crossword clue "Rebounding off the wall in shock (4)" mean?

The definition is "shock". The wordplay uses a reversal. NUTS (reversal="off the wall") = STUN; definition: "shock" The answer is STUN.

Rebounding off the wall in shock (4)

Independent Cryptic #11846 | 10 Across | 2024-09-27 flower