Humorous use of language, not unknown in press (4)

I believe the answer is:

iron

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'not unknown in press' is the definition.
'iron' can be an answer for 'press' (I've seen this in another clue). I'm not certain of the 'not unknown in' bit.

'humorous use of language' is the wordplay.
'humorous use of' becomes 'i' (I am not sure about this - if you are sure you should believe this answer much more).
'language' becomes 'Ron' (Ron is an example).
'i'+'ron'='IRON'

Can you help me to learn more?

(Other definitions for iron that I've seen before include "Smoother - metal" , "Smooth; element" , "See 14" , "Ferrous metal" , "stern" .)

I've seen this clue in The Times.

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