Crossword Genius

Referring to bones, plan is faulty (6)

Ross

I believe the answer is:

spinal

'referring to bones' is the definition.
(the spine is made up of bones)

'plan is faulty' is the wordplay.
'faulty' indicates an anagram.
'plan'+'is'='planis'
'planis' anagrammed gives 'SPINAL'.

(Other definitions for spinal that I've seen before include "Of the vertebrae" , "of a vital column" , "Plains (anag.)" , "Member of dock family with edible stems" , "Type of column" .)

I've seen this clue in The Times.
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