Crossword Genius

It's decorative and there's nothing to add, perhaps (4)

Ross

I believe the answer is:

dado

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

'it's decorative and' is the definition.
I can't tell whether this defines the answer.

'nothing to add perhaps' is the wordplay.
'nothing' becomes 'O' (O resembles 0).
'perhaps' indicates anagramming the letters.
'o'+'add'='oadd'
'oadd' anagrammed gives 'DADO'.

'there's' is the link.

Can you help me to learn more?

(Other definitions for dado that I've seen before include "Rail fixed to a wall" , "Lower section of wall in room" , "Panelled lower part of a wall" , "Decorated lower part of an interior wall" , "Architectural feature" .)

I've seen this clue in the Evening Standard.
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