Age of Argentine criminal hiding leader of outlaws (10)
I believe the answer is:
generation
'age' is the definition.
(thesaurus)
'argentine criminal hiding leader of outlaws' is the wordplay.
'criminal' indicates anagramming the letters.
'hiding' is an insertion indicator.
'leader of' suggests taking the first letters.
The first letter of 'outlaws' is 'o'.
'argentine' is an anagram of 'generatin'.
'generatin' placed around 'o' is 'GENERATION'.
'of' acts as a link.
(Other definitions for generation that I've seen before include "peer group" , "People of the same age" , "Group born around same time" , "what was lost in WW1" , "About thirty years'" .)