Silver currently making comeback, making dosh (5)
I believe the answer is:
wonga
'dosh' is the definition.
(both are slang terms for money)
'silver currently making comeback' is the wordplay.
'silver' becomes 'ag' ('Ag' can be a synonym of 'silver').
'currently' becomes 'now' (I've seen this in other clues).
'making comeback' is a reversal indicator.
'ag'+'now'='agnow'
'agnow' backwards is 'WONGA'.
'making' acts as a link.
(Other definitions for wonga that I've seen before include "Dosh (informal)" , "Spondulicks (slang)" , "Money (sl.)" , "Money (informal)" , "Be sick" .)