Crunches some data, reportedly? (5)
I believe the answer is:
bites
'crunches' is the definition.
(crunch can mean to bite)
'some data reportedly?' is the wordplay.
'some data' becomes 'bytes' (computer memory).
'reportedly?' shows a homophone (sound like) (I've seen 'reportedly' mean this).
'bytes' is a homophone of 'BITES'.
(Other definitions for bites that I've seen before include "Tears with the teeth" , "Morsels" , "Stings" , "Breaks with the teeth" , "Nips to" .)