Biker's gear abandoned in a shelter (8)
I believe the answer is:
leathers
'biker's gear' is the definition.
(leather clothes worn by a motorcyclist)
'abandoned in a shelter' is the wordplay.
'abandoned in' is an anagram indicator (the letter order must be ruined or abandoned).
'a'+'shelter'='ashelter'
'ashelter' anagrammed gives 'LEATHERS'.
(Other definitions for leathers that I've seen before include "Thrashes with animal skins?" , "Calf, Moroccan or chamois, say" .)