Fruit bats primarily employ geolocating sonar (7)
I believe the answer is:
oranges
'fruit' is the definition.
(I've seen this before)
'bats primarily employ geolocating sonar' is the wordplay.
'bats' is an anagram indicator (I've seen this in other clues).
'primarily' says to take the initial letters.
The initial letters of 'employ geolocating' is 'eg'.
'eg'+'sonar'='egsonar'
'egsonar' anagrammed gives 'ORANGES'.
(Other definitions for oranges that I've seen before include "Gear son up for fruit" , "Citrus fruits" , "They are not the only fruit, wrote Jeanette Winterson" , "See 8" , "Citrus fruit" .)