Money, endless variety (6)
I believe the answer is:
specie
'money' is the definition.
(thesaurus)
'endless variety' is the wordplay.
'endless' means to remove the last letter.
'variety' becomes 'species' (species is a kind of variety).
'species' with its final letter taken away is 'SPECIE'.
(Other definitions for specie that I've seen before include "Coin as opposed to paper money" , "Broken pieces for coined money" , "Money as coins" , "Money in the form of coin" , "Coinage, metal money" .)