Box found in Newlands Park (4)
I believe the answer is:
spar
'box' is the definition.
(spar can mean to box)
'in newlands park' is the wordplay.
'in' indicates a hidden word.
'SPAR' can be found hidden inside 'newlands park'.
'found' is the link.
(Other definitions for spar that I've seen before include "Box - mineral - rod" , "Mineral; plane's wing beam" , "Argue" , "Rafter, boom" , "Act as boxer" .)