Jewellery put away by Alec recklessly (8)
I believe the answer is:
necklace
'jewellery' is the definition.
(I know that necklace is a type of jewellery)
'put away by alec recklessly' is the wordplay.
'put away' becomes 'neck' (neck can mean to put away or swallow).
'by' says to put letters next to each other.
'recklessly' is an anagram indicator.
'alec' anagrammed gives 'lace'.
'neck'+'lace'='NECKLACE'
(Other definitions for necklace that I've seen before include "Item of jewellery" , "One may get stoned!" , "decorative band" , "Ornamental feature" , "Piece of jewellery" .)