The Spanish title put inside top coat (6)
I believe the answer is:
enamel
'top coat' is the definition.
'enamel' can be an answer for 'coat' (enamel is a kind of coat). I'm unsure of the 'top' bit.
'the spanish title put inside' is the wordplay.
'the spanish' becomes 'el' ('the' in Spanish).
'title' becomes 'name' (I've seen this in another clue).
'put inside' means one lot of letters goes inside another.
'el' going around 'name' is 'ENAMEL'.
Can you help me to learn more?
(Other definitions for enamel that I've seen before include "Hard, glossy protective coating" , "hard cover" , "glossy coat" , "Hard glossy surface" , "Decorative or protective covering on metal or glass." .)