Diplodocus's bones (3)

I believe the answer is:

doc

I'm a little stuck... Click here to teach me more about this clue!

'bones' is the definition.
(I've seen this before)

'diplodocus's' is the wordplay.
'DOC' is hidden in amongst the letters.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for doc that I've seen before include "Quack" , "GP (colloq.)" , "Physician (colloq.)" , "bones" , "One of the seven dwarfs" .)

I've seen this clue in The Independent.

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