Love to impale non-stop, being conscientious (8)
I believe the answer is:
thorough
'conscientious' is the definition.
(thesaurus)
'love to impale non-stop' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'to impale' is an insertion indicator.
'non-stop' becomes 'through'.
'o' inserted within 'through' is 'THOROUGH'.
'being' acts as a link.
(Other definitions for thorough that I've seen before include "Attending to every detail - complete" , "Meticulous - exhaustive" , "Not superficial or partial" , "Miticulous or exhaustive" , "Absolute, utter" .)