What does the cryptic crossword clue "Delivery service longing for improvement (7)" mean?

The definition is "improvement". The wordplay uses a charade (building blocks). UPS (synonym="UPS") + URGE (synonym="URGE") = UPSURGE; definition: "improvement" The answer is UPSURGE.

Delivery service longing for improvement (7)

Guardian Cryptic #26511 | 26 Across | 2015-03-05 flower

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