I trap seabird within location for surfing (8)
I believe the answer is:
internet
'location for surfing' is the definition.
(as in surfing the web)
'i trap seabird within' is the wordplay.
'trap' becomes 'net' (net is a type of trap).
'seabird' becomes 'tern' (tern is a kind of seabird).
'within' indicates putting letters inside.
'net' going around 'tern' is 'nternet'.
'i'+'nternet'='INTERNET'
(Other definitions for internet that I've seen before include "Global computer communications network" , "Global computer system" , "surfing place" , "World computer network" , "Worldwide network for data transmission" .)