Book design that's impressed as well large (4)

I believe the answer is:

tool

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'book design that's impressed' is the definition.
I can't tell whether this defines the answer.

'as well large' is the wordplay.
'as well' becomes 'too' (both can mean 'also').
'large' becomes 'L' (eg in clothes sizes).
'too'+'l'='TOOL'

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(Other definitions for tool that I've seen before include "Gun" , "Device used for work" , "Weapon" , "Appliance" , "Hand implement" .)

I've seen this clue in The Telegraph.

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