Crossword Genius

As paint may be on edges of door, dash covering it (7)

Ross

I believe the answer is:

nondrip

I'm a little stuck... Click here to teach me more about this clue!

'as paint may be on edges of door dash' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'covering it' is the wordplay.
I cannot really understand how this works, but
'covering' could be 'on' and 'on' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for nondrip that I've seen before include "Thick type of paint" , "Thixotropic (paint)" , "(Of paint) not running" , "depiction of 13 [HERO], presumably" , "Sort of paint" .)

I've seen this clue in The Times.
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