Crossword Genius

Bony obstruction presents challenge (8)

Ross

I believe the answer is:

gauntlet

'challenge' is the definition.
(I've seen this in another clue)

'bony obstruction' is the wordplay.
'bony' becomes 'gaunt' (synonyms).
'obstruction' becomes 'let' (I've seen this in other clues).
'gaunt'+'let'='GAUNTLET'

'presents' acts as a link.

(Other definitions for gauntlet that I've seen before include "handy protection" , "Throw it down to offer a challenge" , "It may be thrown down or run" , "Strong glove, thrown down in challenge" , "that may be punishing for runner" .)

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