Impression made by public relations in time (5)
I believe the answer is:
'impression' is the definition.
(impression created by a printer)
'by public relations in time' is the wordplay.
'by' is a charade indicator (letters next to each other).
'public relations' becomes 'PR' (abbreviation).
'time' becomes 't' (abbreviation).
'pr' put next to 'in' is 'prin'.
'prin'+'t'='PRINT'
'made' is the link.
(Other definitions for print that I've seen before include "Write (in capitals)" , "Copy of a film" , "Reproduce - publish" , "Reproduction picture" , "Publish; photograph" .)