What does the cryptic crossword clue "Superb old rose hybrid shows sign of life (5,8)" mean?

The wordplay uses an anagram. anagram of SUPERB OLD ROSE = BLOODPRESSURE The answer is BLOODPRESSURE.

Superb old rose hybrid shows sign of life (5,8)

Guardian Cryptic #25774 | 10 Down | 2012-10-23 flower