What does the cryptic crossword clue "Huge amount of slime on backed-up register (6)" mean?

The definition is "Huge amount". The wordplay uses a charade (building blocks). GOO (synonym=""slime"") + LOG (reversal=""register"") = GOOGOL; definition: "Huge amount" The answer is GOOGOL.

Huge amount of slime on backed-up register (6)

Guardian Cryptic #29275 | 18 Down | 2024-01-10 flower

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