Tied to deter the roaming (8)
I believe the answer is:
tethered
'tied' is the definition.
(thesaurus)
'deter the roaming' is the wordplay.
'roaming' indicates anagramming the letters.
'deter'+'the'='deterthe'
'deterthe' is an anagram of 'TETHERED'.
'to' acts as a link.
(Other definitions for tethered that I've seen before include "Tied (animals) up" , "Bound" , "Of animal, secured or hobbled" , "Confined in range by tied rope" , "Of animal, with rope fastened to prevent straying" .)