Crossword Genius

Boat steerer loses its first milk provider (5)

Ross

I believe the answer is:

udder

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'milk provider' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

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(Other definitions for udder that I've seen before include "Animal mammary gland" , "Animal organ with more than one teat" , "milk supplier" , "Milk supply" , "Bovine mammary gland" .)

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