Yes German females like oranges! (6)

I believe the answer is:

jaffas

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

'oranges' is the definition.
Although both the answer and definition are plural nouns, I don't see how they can define each other.

'yes german females like' is the wordplay.
'yes german' becomes 'ja' (I can't explain this - if you can you should believe this answer much more).
'females' becomes 'ff' (an abbreviation for female written twice).
'like' becomes 'as'.
'ja'+'ff'+'as'='JAFFAS'

Can you help me to learn more?

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app