What does the cryptic crossword clue "Many notes after poor term, one's performance raised (8)" mean?

The wordplay uses an anagram. anagram of TERM (synonym="TERM") + SOLO (synonym="one’s performance") = TREMOLOS The answer is TREMOLOS.

Many notes after poor term, one's performance raised (8)

Guardian Cryptic #29214 | 19 Down | 2023-10-30 flower