What does the cryptic crossword clue "Turn over board to see gander (4)" mean?

The definition is "gander". The wordplay uses a reversal. KEEP (reversal="subsistence, ‘board’") = PEEK; definition: "gander" The answer is PEEK.

Turn over board to see gander (4)

Guardian Cryptic #29654 | 26 Across | 2025-03-28 flower