Pitch tent here — it provides data link (8)
I believe the answer is:
ethernet
'it provides data link' is the definition.
'pitch tent here' is the wordplay.
'pitch' indicates anagramming the letters (pitch can mean to throw or rock around).
'tent'+'here'='tenthere'
'tenthere' with letters rearranged gives 'ETHERNET'.
(Other definitions for ethernet that I've seen before include "comms system" , "Network of a number of computers" , "Computer system" , "System connecting several computers" , "food" .)