Crossword Genius

Lip-smacking snack? (7,8)

Ross

I believe the answer is:

knuckle sandwich

I'm a little stuck...
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Here is my best explanation:

'lip-smacking snack?' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'smacking snack?' is the wordplay.
'smacking' becomes 'knuckle' (I can't justify this - if you can you should give a lot more credence to this answer).
'snack?' becomes 'sandwich' (I've seen this before).
'knuckle'+'sandwich'='KNUCKLE SANDWICH'

Ross

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This clue was last seen in The Independent

(Other definitions for knuckle sandwich that I've seen before include "bunch", "Buffet", "hit", "Punch in mug", "piece of pork between slices of bread", "Bunch of fives" and "Slug".)

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