Crossword Genius

Expose as a lie Nationalist trouble (4)

Ross

I believe the answer is:

nail

'expose as a lie' is the definition.
(I've seen this before)

'nationalist trouble' is the wordplay.
'nationalist' becomes 'n' (abbreviation in politics).
'trouble' becomes 'ail' ('ail' can be a synonym of 'trouble'**).
'n'+'ail'='NAIL'

(Other definitions for nail that I've seen before include "Fixing device" , "Hits this in the head to be bang-on" , "Bring down" , "A metal pin or spike" , "Finger end; fasten" .)

I've seen this clue in The Telegraph.
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