Hamburger maybe covered in extremely crunchy fruit? (6)
I believe the answer is:
cherry
'fruit?' is the definition.
(I know that cherry is a type of fruit)
'hamburger maybe covered in extremely crunchy' is the wordplay.
'hamburger maybe' becomes 'herr' (I've seen this in another clue).
'covered in' means one lot of letters goes inside another.
'extremely' means to remove the middle letters (only the extremes of the word are used).
'crunchy' with its middle taken out is 'cy'.
'herr' inserted inside 'cy' is 'CHERRY'.
(Other definitions for cherry that I've seen before include "Bright red" , "What fruiterer may have" , "Small succulent red stone-fruit" , "Virginity (slang)" , "Greyfriars Bob" .)