Crossword Genius

No room for litres of red wine? Mark suggests something could be squeezed in (5)

Ross

I believe the answer is:

caret

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'no' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'room for litres of red wine? mark suggests something could be squeezed in' is the wordplay.
I cannot quite see how this works, but
'room' could be 'car' (car is a kind of room) and 'car' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for caret that I've seen before include "Sign something's lacking" , "Weeding tool" , "Upward arrow mark" , "this reveals something missing" , "Symbol to show something is to be inserted" .)

I've seen this clue in The Telegraph.
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