Hardy (anag) — persistent trouble with many aspects (5)

I believe the answer is:

hydra

(Other definitions for hydra that I've seen before include "Many-headed foe of Hercules" , "Persistent trouble" , "Mythical nine-headed monster" , "Mythical many-headed snake" , "Multi-headed monster slain by Hercules" .)

I've seen this clue in The Guardian.

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