Like groups of valuable things (6)
I believe the answer is:
assets
'valuable things' is the definition.
(I've seen this in another clue)
'like groups' is the wordplay.
'like' becomes 'as'.
'groups' becomes 'sets' (I've seen this in other clues).
'as'+'sets'='ASSETS'
'of' is the link.
(Other definitions for assets that I've seen before include "Advantages" , "Valuables, things worth having" , "Personal wealth" , "Properties that have money value" , "Company's property" .)