July 1st, relative goes on a trip (5)
I believe the answer is:
jaunt
'a trip' is the definition.
(I know that trip can be written as jaunt)
'july 1st relative goes on' is the wordplay.
'july ast' becomes 'j' (ast letter of 'july').
'relative' becomes 'aunt' (aunt is a type of relative).
'goes on' says to put letters next to each other.
'j'+'aunt'='JAUNT'
(Other definitions for jaunt that I've seen before include "Pleasure trip" , "Pleasure journey" , "Outing" , "Ramble - excursion" , "Short excursion for pleasure" .)