Impression right in liquid measure (5)
I believe the answer is:
'impression' is the definition.
(impression created by a printer)
'right in liquid measure' is the wordplay.
'right' becomes 'r' (common abbreviation).
'in' indicates putting letters inside.
'liquid measure' becomes 'pint' (pint is a kind of liquid measure).
'r' going within 'pint' is 'PRINT'.
(Other definitions for print that I've seen before include "Run off" , "Write (in capitals)" , "Publish; patterned fabric" , "Fabric pattern" , "Reproduce - publish" .)