Saw bishop parking car in front (7)
I believe the answer is:
proverb
'saw' is the definition.
(a saw can mean a proverb or maxim)
'bishop parking car in front' is the wordplay.
'bishop' becomes 'B' (abbreviation for bishop in chess).
'parking' becomes 'p' (abbreviation on road signs).
'car' becomes 'rover' (former British car manufacturer).
'in front' means one lot of letters go next to another.
'p'+'rover'='prover'
'b' after 'prover' is 'PROVERB'.
(Other definitions for proverb that I've seen before include "Traditional saying" , "Aphorism" , "Adage, pithy saying" , "Saying encapsulating a general truth" , "OT saying" .)