Crossword Genius

African river carries pirate leader repeatedly to chest spot? (6)

Ross

I believe the answer is:

nipple

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

'chest spot?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'african river carries pirate leader repeatedly' is the wordplay.
'african river' becomes 'nile' (I've seen this before).
'carries' is an insertion indicator (inserted letters carried inside).
'leader' says to take the initial letters.
'repeatedly' shows that letters should be duplicated.
The first letter of 'pirate' is 'p'.
'p' duplicated is 'pp'.
'nile' placed around 'pp' is 'NIPPLE'.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for nipple that I've seen before include "Chest projection" , "Source of mother's milk" , "Teat" , "Oil supplier" , "private area" .)

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