Ultimately pomelo varieties? (7)

I believe the answer is:

oranges

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

'ultimately pomelo varieties?' is the definition.
I can't judge whether this definition defines the answer.

'ultimately pomelo varieties?' is the wordplay.
'ultimately' suggests the final letters.
'varieties?' becomes 'ranges' (I am not sure about this - if you are sure you should believe this answer much more).
The last letter of 'pomelo' is 'o'.
'o'+'ranges'='ORANGES'

Can you help me to learn more?

(Other definitions for oranges that I've seen before include "Citrus fruits" , "Gear son up for fruit" , "Go snare these fruits" , "'Mandarins, say (7)'" , "Navel, blood and Seville are all varieties of these" .)

I've seen this clue in The Everyman puzzle in The Observer.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.