Crossword Genius

Approach adult in bar after mistake (4,4)

Ross

I believe the answer is:

slip road

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'approach adult' 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?

'in bar after mistake' is the wordplay.
'in bar' becomes 'road' (I can't justify this - if you can you should give a lot more credence to this answer).
'after' is a charade indicator (letters next to each other).
'mistake' becomes 'slip' (slip is a kind of mistake).
'road' put after 'slip' is 'SLIP-ROAD'.

Can you help me to learn more?

(Other definitions for slip road that I've seen before include "way to access motorway" , "Joining lane" , "Way to leave or join a motorway" , "Motorway approach or exit" , "Motorway access point" .)

I've seen this clue in The Independent.
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