Crossword Genius

They're unable to hear or see the cars outside (5,4)

Ross

I believe the answer is:

cloth ears

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

'they're unable to hear' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'see the cars outside' is the wordplay.
'see' becomes 'lo' ('lo' is an archaic exclamation meaning 'look!').
'outside' is an insertion indicator.
'lo'+'the'='lothe'
'lothe' inserted into 'cars' is 'CLOTH-EARS'.

'or' is the link.

Can you help me to learn more?

(Other definitions for cloth ears that I've seen before include "One not attending" , "Person not hearing through inattention" .)

I've seen this clue in the Evening Standard.
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