Crossword Genius

Hard to falsify papers (5)

Ross

I believe the answer is:

rigid

'hard' is the definition.
(I've seen this before)

'falsify papers' is the wordplay.
'falsify' becomes 'rig'.
'papers' becomes 'id' (identification papers).
'rig'+'id'='RIGID'

'to' acts as a link.

(Other definitions for rigid that I've seen before include "Stiff and inflexible" , "Firmly fixed" , "starched too much?" , "Stiff, unbending" , "Not flexible" .)

I've seen this clue in The Times.
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