Kind of unusual age to cry (8)
I believe the answer is:
category
'kind' is the definition.
(I've seen this before)
'unusual age to cry' is the wordplay.
'unusual' indicates an anagram.
'age'+'to'+'cry'='agetocry'
'agetocry' is an anagram of 'CATEGORY'.
'of' is the link.
(Other definitions for category that I've seen before include "Coy Greta found among this class of things" , "Group of classified items" , "Logical grouping" , "Class of grey coat" , "Class of grey-coat" .)