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' means one lot of letters go next to another.
'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" .)