What does the cryptic crossword clue "Noticing alumnus’s help (9)" mean?

The definition is "help". The wordplay uses a charade (building blocks). OB (synonym="OB") + SERVANT (synonym="SERVANT") = OBSERVANT; definition: "Noticing" The answer is OBSERVANT.

Noticing alumnus’s help (9)

Guardian Cryptic #27658 | 22 Across | 2018-11-05 flower

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Also seen in

Guardian Cryptic #23996 (2007-02-09)