Crossword Genius

Essential when climbing to get fruit (7)

Ross

I believe the answer is:

satsuma

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'fruit' is the definition.
(I know this)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for satsuma that I've seen before include "Loose-skinned tangerine" , "Citrus fruit from Japan" , "Orange - type of pottery" , "sort of orange" , "Orange, district and style of Japanese pottery" .)

I've seen this clue in The Telegraph and The Sun.
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