Yes, Russian goes over the Maori fruit (4)
I believe the answer is:
date
'fruit' is the definition.
(date is a kind of fruit)
'yes russian goes over the maori' is the wordplay.
'yes russian' becomes 'da' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'goes over' means one lot of letters go next to another.
'the maori' becomes 'te' (I've seen this in other clues).
'da'+'te'='DATE'
Can you help me to learn more?
(Other definitions for date that I've seen before include "Step out with" , "Romantic meeting" , "Day, month and year" , "Year or day when an event occurred" , "For example, sell by" .)