Gold the Feds spread added to (9)
I believe the answer is:
augmented
'added to' is the definition.
(I've seen this in another clue)
'gold the feds spread' is the wordplay.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'the feds' becomes 'gmen' (I've seen this in another clue).
'spread' becomes 'ted' (I've seen this in another clue).
'au'+'gmen'+'ted'='AUGMENTED'
(Other definitions for augmented that I've seen before include "Grew, increased" , "Reinforced" , "Enhanced" , "Added to, increased" .)