Suitable job involving one employed by primate (8)
I believe the answer is:
apposite
'suitable' is the definition.
(apposite means suitable or appropriate)
'job involving one employed by primate' is the wordplay.
'job' becomes 'post' (post is a kind of job).
'involving' is an insertion indicator.
'one' becomes 'I' (Roman numeral).
'employed by' is an insertion indicator (inserted letters used or employed inside).
'primate' becomes 'ape' (large primate).
'post' enclosing 'i' is 'posit'.
'posit' going within 'ape' is 'APPOSITE'.
(Other definitions for apposite that I've seen before include "Appropriate, apt" , "Suitable, relevant" , "Germane" , "Of a remark, appropriate for the occasion (8)" , "Suited for the purpose" .)