Saw wanderer in borders of Punjab (7)
I believe the answer is:
proverb
'saw' is the definition.
('proverb' can be a synonym of 'saw')
'wanderer in borders of punjab' is the wordplay.
'wanderer' becomes 'rover' ('rover' can be a synonym of 'wanderer').
'in' means one lot of letters goes inside another.
'borders of' suggests removing the centre.
'punjab' with its middle removed is 'pb'.
'rover' placed into 'pb' is 'PROVERB'.
(Other definitions for proverb that I've seen before include "Maxim" , "Short saying expressing a supposed truth" , "Saying encapsulating a general truth" , "Old saying, perhaps by Solomon?" , "encapsulate wisdom" .)