Trace of metal for example recalled (5)
I believe the answer is:
tinge
'trace' is the definition.
(I've seen this before)
'metal for example recalled' is the wordplay.
'metal' becomes 'tin' (tin is a kind of metal**).
'for example' becomes 'eg' ('e.g.' can be a synonym of 'for example').
'recalled' is a reversal indicator.
'eg' backwards is 'ge'.
'tin'+'ge'='TINGE'
'of' acts as a link.
(Other definitions for tinge that I've seen before include "A colourful" , "Slight colouring" , "Colour slightly; trace" , "A slight shade of colour" , "A shade or a nuance" .)