Sign snobs flee without clothing, which is unseemly (7)
I believe the answer is:
ignoble
'sign snobs flee without clothing which is unseemly' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I can't see?
'sign snobs flee without' is the wordplay.
I cannot really understand how this works, but
'without' could be 'no' and 'no' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for ignoble that I've seen before include "Base, not honourable" , "in a lower category" , "Debased in character or purpose" , "not in the top class" , "'Base, dishonourable (7)'" .)