Crossword Genius

Chase animal with a rake in tunnel underground (8)

Ross

I believe the answer is:

catacomb

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

'chase' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'animal with a rake in tunnel underground' is the wordplay.
'animal' becomes 'cat' (I've seen this in other clues).
'with' is a charade indicator (letters next to each other).
'rake in tunnel underground' becomes 'comb' (I am not sure about this - if you are sure you should believe this answer much more).
'cat'+'a'+'comb'='CATACOMB'

Can you help me to learn more?

(Other definitions for catacomb that I've seen before include "Professional kneader" , "Place to bury" , "crypt" , "series of tunnels" , "Subterranean cemetery" .)

I've seen this clue in The Hindu.
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