Journalist witnessed item smuggled into prison?

I believe the answer is:

hacksaw

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'item smuggled into prison?' is the definition.
I can't judge whether this definition defines the answer.

'journalist witnessed' is the wordplay.
'journalist' becomes 'hack' (I've seen this in other clues).
'witnessed' becomes 'saw' ('see' can be a synonym of 'witness').
'hack'+'saw'='HACKSAW'

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(Other definitions for hacksaw that I've seen before include "Metal cutter" , "Blade in a frame under tension" , "something cutting" , "Toothed tool for cutting metal" , "7 for metal" .)

I've seen this clue in The Telegraph.

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