How lovely, toilet paper turned red in Spain (8)

'red in spain' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'how lovely toilet paper turned' is the wordplay.
'how lovely' becomes 'ah' (I am not sure about this - if you are sure you should believe this answer much more).
'toilet' becomes 'can' (synonyms).
'paper' becomes 'rag' (rag can mean a newspaper).
'turned' shows that the letters should be reversed in order.
'ah'+'can'+'rag'='ahcanrag'
'ahcanrag' back-to-front is 'GARNACHA'.

Can you help me to learn more?