Paint title in enormous letters (just initials) (6)
I believe the answer is:
enamel
'paint' is the definition.
(I know that enamel is a type of paint)
'title in enormous letters just initials' is the wordplay.
'title' becomes 'name' (I've seen this before).
'in' is an insertion indicator.
'just initials' indicates taking the first letters.
The first letters of 'enormous letters' is 'el'.
'name' going into 'el' is 'ENAMEL'.
(Other definitions for enamel that I've seen before include "art form" , "canine protection?" , "Hard substance covering teeth" , "Hard shiny surface as on teeth" , "Hard glossy paint" .)