Making a face, head away for trip (6)
I believe the answer is:
outing
'for trip' is the definition.
(I've seen this in another clue)
'making a face head away' is the wordplay.
'making a face' becomes 'pouting' (pouting is a kind of making a face).
'head away' means to remove the first letter (I've seen 'heading away' mean this (the word's 'head' is removed)).
'pouting' with its first letter removed is 'OUTING'.
(Other definitions for outing that I've seen before include "Day excursion" , "that puts the private on parade?" , "Excursion, trip" , "Revealing orientation" , "Jaunt" .)