Crossword Genius

Horse with info about duck being cooler underground? (7)

Ross

I believe the answer is:

dungeon

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

'cooler underground?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'horse with info about duck' is the wordplay.
'horse' becomes 'dun' (I've seen this before).
'with' means one lot of letters go next to another.
'info' becomes 'gen' (informal term for information).
'about' means one lot of letters goes inside another.
'duck' becomes 'o' (resembles zero - 'duck' in cricket).
'gen' enclosing 'o' is 'geon'.
'dun'+'geon'='DUNGEON'

'being' acts as a link.

Can you help me to learn more?

(Other definitions for dungeon that I've seen before include "old prison" , "prison the result" , "Unpleasant cell" , "Prison cell, often underground" , "Keep" .)

I've seen this clue in The Times.
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