Crossword Genius

Super-sturdy (5-4)

Ross

I believe the answer is:

heavy-duty

(Other definitions for heavy-duty that I've seen before include "Designed to withstand much wear" , "Intended to withstand hard use - sounds weighty" , "Intended to withstand hard use, or weighty tax" , "Made to withstand serious wear" , "Substantial" .)

I've seen this clue in the King Feature Syndicate.
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