Crossword Genius

Mammoth is not bound to pachyderm’s middle (6)

Ross

I believe the answer is:

mighty

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'mammoth' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

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(Other definitions for mighty that I've seen before include "Powerful - huge" , "Strong, powerful" , "Arrogant people are often described as high and . . . . . ." , "Powerful - exalted" , "Having great strength" .)

I've seen this clue in The Times.
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