Blind German communist regularly missing signage (3,7)
I believe the answer is:
red herring
'blind german' is the definition.
'red herring' can be an answer for 'blind' (thesaurus). I am not sure about the 'german' bit.
'communist regularly missing signage' is the wordplay.
'communist' becomes 'red' (red can informally mean communist).
'regularly missing signage' becomes 'herring' (I can't explain this - if you can you should believe this answer much more).
'red'+'herring'='RED HERRING'
Can you help me to learn more?
(Other definitions for red herring that I've seen before include "Irrelevant topic" , "Diversion intended to distract attention from the main issue" , "It may well put you off" , "fish" , "bait, of a certain sort" .)