Poor Elvis runs for cash (6)
I believe the answer is:
silver
'for cash' is the definition.
(thesaurus)
'poor elvis runs' is the wordplay.
'poor' indicates anagramming the letters.
'runs' becomes 'r' (cricket abbreviation).
'elvis' is an anagram of 'silve'.
'silve'+'r'='SILVER'
(Other definitions for silver that I've seen before include "Silver of precious metal" , "Compensatory feature of cloud" , "Soft, white, precious metal" , "See 20" , "Grey-haired" .)