Saw traveller entering pubs regularly (7)
I believe the answer is:
proverb
'saw' is the definition.
(a saw can mean a proverb or maxim)
'traveller entering pubs regularly' is the wordplay.
'traveller' becomes 'rover' (rover is a kind of traveller).
'entering' indicates putting letters inside.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternating letters of 'pubs' are 'pb'.
'rover' going inside 'pb' is 'PROVERB'.
(Other definitions for proverb that I've seen before include "Generally true saying" , "Make haste slowly, perhaps" , "Short saying expressing a supposed truth" , "Saying encapsulating a general truth" , "Traditional saying" .)