What does the cryptic crossword clue "Lough and river parasite (5)" mean?

The definition is "parasite". The wordplay uses a charade (building blocks). L (first_letter="Lough") + OUSE (synonym="river") = LOUSE; definition: "parasite" The answer is LOUSE.

Lough and river parasite (5)

Daily Mail Cryptic #16241 | 6 Down | 2020-01-31 flower

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