Coarse show entertaining the Spanish (10)
I believe the answer is:
indelicate
'coarse' is the definition.
(I've seen this before)
'show entertaining the spanish' is the wordplay.
'show' becomes 'indicate' (synonyms).
'entertaining' means one lot of letters goes inside another (inviting in, as for dinner).
'the spanish' becomes 'el' ('the' in Spanish).
'indicate' going around 'el' is 'INDELICATE'.
(Other definitions for indelicate that I've seen before include "lacking taste" , "Saucy" , "Practised (a play)" , "Rude - tasteless" , "Rather rude" .)