Bit of advice about right excursion (4)
I believe the answer is:
trip
'excursion' is the definition.
(a trip is an excursion or outing)
'bit of advice about right' is the wordplay.
'bit of advice' becomes 'tip' (tip can mean a hint or piece of advice).
'about' is an insertion indicator.
'right' becomes 'r' (abbreviation).
'tip' placed around 'r' is 'TRIP'.
(Other definitions for trip that I've seen before include "Excursion (while on drugs?)" , "Journey; make a mistake" , "Set off for" , "Catch one's foot" , "Journey, excursion" .)