Crossword Genius

Leader missed a typo ultimately within heading (7)

Ross

I believe the answer is:

caption

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'heading' is the definition.
(I know that caption is a type of title)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for caption that I've seen before include "Pontiac (anag)" , "Text under photo" , "Provide (a picture) with a title" , "Elegance of dress" , "Explanation of an illustration" .)

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