Grandiloquent end to portico, red and German (7)

I believe the answer is:

orotund

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'grandiloquent' is the definition.
(thesaurus)

'end to portico red and german' is the wordplay.
'end to' suggests the final letters.
'red' becomes 'rot' (I can't justify this - if you can you should give a lot more credence to this answer).
'and german' becomes 'und' ('and' in German).
The final letter of 'portico' is 'o'.
'o'+'rot'+'und'='OROTUND'

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(Other definitions for orotund that I've seen before include "Loud or pompous" , "Pompous (in style)" , "Bombastic" , "Resonant" , "Of speech, pompous and imposing" .)

I've seen this clue in The Independent.

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