Changing gears on fruit (7)
I believe the answer is:
oranges
'fruit' is the definition.
(oranges are a type of fruit)
'changing gears on' is the wordplay.
'changing' indicates anagramming the letters.
'gears'+'on'='gearson'
'gearson' is an anagram of 'ORANGES'.
(Other definitions for oranges that I've seen before include "Navel, blood and Seville are all varieties of these" , "a zesty lot" , "Citrus fruit" , "They are not the only fruit, wrote Jeanette Winterson" , "Gear son up for fruit" .)