What does the cryptic crossword clue "If not upset, BBC presenter loses face in dodgy poll here (6,7)" mean?

The wordplay uses acrostic. RO (synonym="RO") + TTENBOROUGH (synonym="Sir David, ‘BBC presenter’") = ROTTENBOROUGH The answer is ROTTENBOROUGH.

If not upset, BBC presenter loses face in dodgy poll here (6,7)

Guardian Cryptic #29364 | 26 Across | 2024-04-23 flower