Crime writer, richest I suspect (8)
I believe the answer is:
christie
'crime writer' is the definition.
(Agatha Christie)
'richest i suspect' is the wordplay.
'suspect' is an anagram indicator (a suspicious or unusual spelling).
'richest'+'i'='richesti'
'richesti' anagrammed gives 'CHRISTIE'.
(Other definitions for christie that I've seen before include "Agatha ..., mystery story writer" , "Detective writer" , "'Agatha..., crime writer (8)'" , "Serial killer" , "family with lots to do?" .)