I paid sentries for working -- people getting regular payments (13)
I believe the answer is:
Here is my best explanation:
'people getting regular payments' is the definition.
'i paid sentries for working' is the subsidiary indication.
'for working' is an anagram indicator.
'ipaidsentries' anagrammed gives 'stipendiaries'.
(Another definition for stipendiaries that I've seen is "People who are paid".)