World's longest river crossing a mafia boss guaranteed (6-2)
I believe the answer is:
nailed-on
'guaranteed' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'world's longest river crossing a mafia boss' is the wordplay.
'world's longest river' becomes 'nile' (I've seen this before).
'crossing' is an insertion indicator (to cross can mean to go over or around).
'mafia boss' becomes 'don' (term for a mafia leader).
'nile' enclosing 'a' is 'naile'.
'naile'+'don'='NAILED-ON'
Can you help me to learn more?
I've seen this clue in The Independent.
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