What does the cryptic crossword clue "Rival pic more OTT when reviewed (10)" mean?

The definition is "Rival". The wordplay uses an anagram. anagram of PIC + MORE + OTT = COMPETITOR; definition: "Rival" The answer is COMPETITOR.

Rival pic more OTT when reviewed (10)

Daily Mail Cryptic #17017 | 25 Across | 2023-01-23 flower