Crossword Genius

Sticky material casing marrow in bones (5)

Ross

I believe the answer is:

tarsi

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'bones' is the definition.
(bones of the foot)

'sticky material casing marrow' is the wordplay.
'sticky material' becomes 'tar' (tar is a sticky material).
'casing marrow' becomes 'si' (I can't justify this - if you can you should believe this answer much more).
'tar'+'si'='TARSI'

'in' is the link.

Can you help me to learn more?

(Other definitions for tarsi that I've seen before include "Parts of skeleton" , "parts of leg" , "collections of bones?" , "Foot bones" , "Bones of the ankles and heels" .)

I've seen this clue in the Sydney Morning Herald.
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