Call wearing the Spanish coat (6)
I believe the answer is:
enamel
'coat' is the definition.
(I know that enamel is a type of coat)
'call wearing the spanish' is the wordplay.
'call' becomes 'name' (as in calling or naming someone something).
'wearing' indicates putting letters inside.
'the spanish' becomes 'el' ('the' in Spanish).
'name' put inside 'el' is 'ENAMEL'.
(Other definitions for enamel that I've seen before include "Hard shiny coating on surface" , "Hard-drying paint" , "Hard shiny coating as on teeth" , "Shiny coat as on teeth" , "Hard, glossy protective coating" .)