What does the cryptic crossword clue "Grumble increase's ultimately trivial (5)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Grumble increase's ultimately trivial (5)

Guardian Cryptic #28594 | 21 Down | 2021-11-04 flower

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