Notice present by new Tesla advocate (8)
I believe the answer is:
adherent
'advocate' is the definition.
(I've seen this before)
'notice present by new tesla' is the wordplay.
'notice' becomes 'ad'.
'present' becomes 'here' ('here' can be similar in meaning to 'present'**).
'by' means one lot of letters go next to another.
'new' becomes 'n'.
'tesla' becomes 't' (scientific unit).
'ad'+'here'+'n'+'t'='ADHERENT'
(Other definitions for adherent that I've seen before include "lover" , "sticker" , "One supporting" , "Dedicated supporter" , "Sticking; partisan" .)