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1a. Organise fish, if unknown (6) C?????
24a. Fight and cry around the river (5) ??A?L
15d. Close to having fever treated, don't you worry (5, 4) N?V?R ???? - is it NEVER MIND?
21d. Note a doctor rings to get some grass (6) ?A?B??

24a. Fight and cry around the river (5) ??A?L
Brawl
15d. Close to having fever treated, don't you worry (5, 4) N?V?R ???? - is it NEVER MIND?
Never fear
Anagram of Fever and near (close to)

21d. Note a doctor rings to get some grass (6) ?A?B??
Bamboo

Looks like CODIFY

Thank you, both.