Crossword Genius

Having endless energy (8)

Ross

I believe the answer is:

tireless

(Other definitions for tireless that I've seen before include "Having great energy" , "Permanently lively" , "Never grows weary, inexhaustible" , "Having inexhaustible energy" , "Indefatigable, unflagging" .)

I've seen this clue in The Star Tribune.
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