Luggage in hold? (4)
I believe the answer is:
grip
I believe this is a double definition.
'luggage' is the first definition.
(grip is a kind of luggage)
'hold?' is the second definition.
(gripping is a kind of holding)
'in' is the link.
(Other definitions for grip that I've seen before include "member of camera crew" , "Grasp securely" , "Catch" , "Take firm hold of travelling bag?" , "Hold hard" .)