Shapeless, abandoned (5)

I believe the answer is:

loose

I believe this is a double definition.

'shapeless' is the first definition.
(thesaurus)

'abandoned' is the second definition.
(thesaurus)

(Other definitions for loose that I've seen before include "Showing fast behaviour" , "released from confinement" , "Imprecise" , "Promiscuous" , "wobbly" .)

I've seen this clue in The Everyman puzzle in The Observer.

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