Crossword Genius

One breaks a little back bone (5)

Ross

I believe the answer is:

tibia

'bone' is the definition.
(tibia is a kind of bone)

'one breaks a little back' is the wordplay.
'one' becomes 'i' (Roman numeral).
'breaks' is an insertion indicator (inserted letters break into the word).
'a little' becomes 'abit' (synonyms).
'back' is a reversal indicator.
'i' inserted within 'abit' is 'aibit'.
'aibit' backwards is 'TIBIA'.

(Other definitions for tibia that I've seen before include "Bone of the lower leg" , "Bone in osso bucco" , "The formal shinbone" , "The large shinbone" , "part of skeleton" .)

I've seen this clue in The Globe and Mail.
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