Outings without Jack's relatives (5)
I believe the answer is:
aunts
'relatives' is the definition.
(aunt is a kind of relative)
'outings without jack's' is the wordplay.
'outings' becomes 'jaunts' ('jaunt' can be a synonym of 'outing').
'without' indicates named letters should be taken away.
'jack' becomes 'J' (playing card abbreviation).
'jaunts' with 'j' removed is 'AUNTS'.
(Other definitions for aunts that I've seen before include "relatively speaking" , "Relatives get a peculiar US tan" , "Female relatives, usually older" , "Relatives get an odd US tan" , "Sally and others" .)