Crossword Genius

A modern novel? That is highly unlikely (5,2)

Ross

I believe the answer is:

dream on

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'is highly unlikely' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'a modern novel?' is the wordplay.
'novel?' indicates anagramming the letters (I've seen 'novel' mean this (letters in a new or novel order)).
'a'+'modern'='amodern'
'amodern' anagrammed gives 'DREAM ON'.

'that' acts as a link.

Can you help me to learn more?

(Other definitions for dream on that I've seen before include "That's unlikely! (colloquial)" , "Come off it!" .)

I've seen this clue in The Times.
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