Answer is back in applications for people (7)
I believe the answer is:
aussies
'people' is the definition.
(Aussie is an example)
'answer is back in applications' is the wordplay.
'answer' becomes 'a' (abbreviation eg in Q and A).
'back' shows that the letters should be reversed in order.
'in' indicates putting letters inside.
'applications' becomes 'uses' (use can mean an application or purpose).
'is' reversed gives 'si'.
'si' going within 'uses' is 'ussies'.
'a'+'ussies'='AUSSIES'
'for' is the link.
(Other definitions for aussies that I've seen before include "Islanders" , "Our Ashes opponents" , "Antipodeans, in short" , "Informal people from Down Under" , "Australians (colloq.)" .)