What does the cryptic crossword clue "Difficulty for retiring opera singer to sack alto (7)" mean?

The definition is "Difficulty". The wordplay uses a reversal. PRO (synonym="‘for’") + BLEM (synonym="BLEM") = PROBLEM; definition: "Difficulty" The answer is PROBLEM.

Difficulty for retiring opera singer to sack alto (7)

Guardian Cryptic #28779 | 20 Down | 2022-06-09 flower

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