What does the cryptic crossword clue "Exercise affected aliens' discipline (8)" mean?

The definition is "discipline". The wordplay uses an anagram. anagram of PE (synonym="exercise") + ALIENS (synonym="ALIENS") = PENALISE The answer is PENALISE.

Exercise affected aliens' discipline (8)

Guardian Cryptic #29198 | 25 Across | 2023-10-11 flower

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