Crossword Genius

German border that's right dirtier (7)

Ross

I believe the answer is:

grimier

'dirtier' is the definition.
('grimy' can be similar in meaning to 'dirty')

'german border that's right' is the wordplay.
'german' becomes 'g' (abbreviation).
'border' becomes 'rim' (both can mean an edge).
'that's' becomes 'ie'.
'right' becomes 'r' (abbreviation).
'g'+'rim'+'ie'+'r'='GRIMIER'

(Another definition for grimier that I've seen is " increasingly filthy".)

I've seen this clue in the Sydney Morning Herald.
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