Old-fashioned printer needed this — as in lithographic op? Yes? (10)

'old-fashioned printer needed this' is the definition.
(stand for holding text to be printed)

'in lithographic op? yes?' is the wordplay.
I cannot really understand how this works, but
'op?' could be 'op' and 'op' is found within the answer.
'yes?' could be 'y' and 'y' is found in the answer.
This may be the basis of clue (or it may be nonsense).

'as' is the link.

Can you help me to learn more?