Ginger isn't rearranging piece of jewellery (6,4)
I believe the answer is:
signet ring
'piece of jewellery' is the definition.
'signet ring' can be an answer for 'jewellery' (signet ring is a kind of jewellery). I am not certain of the 'piece of' bit.
'ginger isn't rearranging' is the wordplay.
'rearranging' indicates anagramming the letters (I've seen 'rearranged' mean this).
'ginger'+'isnt'='gingerisnt'
'gingerisnt' is an anagram of 'SIGNET-RING'.
Can you help me to learn more?
(Other definitions for signet ring that I've seen before include "that 9,16 [QUEENS MARKER] reportedly uses" , "Item of jewellery, often engraved with an initial" , "band used to make impression" , "Personal seal" , "it makes an impression" .)