Black, with a reversible metallic piece (5)
I believe the answer is:
cilla
'black' is the definition.
(I've seen this in other clues)
'with a reversible metallic piece' is the wordplay.
'a reversible' shows that the letters should be reversed in order.
'with' indicates a hidden word.
'allic' is hidden in the letters of 'metallic piece'.
'allic' in reverse letter order is 'CILLA'.
(Other definitions for cilla that I've seen before include "- Black, TV personality and singer" , "Colourful old singer" .)