Isolated police officers brought back to catch wicked one (8)
I believe the answer is:
sporadic
'isolated' is the definition.
(similar in meaning)
'police officers brought back to catch wicked one' is the wordplay.
'police officers' becomes 'cops' (cop is a kind of police officer).
'brought back' says the letters should be written backwards.
'to catch' indicates putting letters inside.
'wicked' becomes 'rad' (both can informally mean excellent).
'one' becomes 'I' (Roman numeral).
'cops' reversed gives 'spoc'.
'rad'+'i'='radi'
'spoc' going around 'radi' is 'SPORADIC'.
(Other definitions for sporadic that I've seen before include "Having separate patches" , "Scattered - irregular" , "Random" , "Isolated; intermittent" , "Occurring here and there, like picadors" .)