The hidden danger of mine subsidence (7)

I believe the answer is:

pitfall

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'the hidden danger' is the definition.
(I've seen this in another clue)

'mine subsidence' is the wordplay.
'mine' becomes 'pit' (down the pit).
'subsidence' becomes 'fall' (I can't justify this - if you can you should believe this answer much more).
'pit'+'fall'='PITFALL'

'of' is the link.

Can you help me to learn more?

(Other definitions for pitfall that I've seen before include "Unexpected problem" , "Unforeseen difficulty" , "Trap in the form of a concealed hole" , "Hazard" , "Unexpected difficulty or danger" .)

I've seen this clue in The Irish Independent.

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