What does the cryptic crossword clue "Rook reflected in binoculars (3)" mean?

The definition is "Rook". The wordplay uses a reversal. NOC (reversal="NOC") = CON; definition: "Rook" The answer is CON.

Rook reflected in binoculars (3)

Guardian Cryptic #29390 | 19 Across | 2024-05-23 flower