Working in retail, securing name over a number of years (9)
I believe the answer is:
triennial
'over a number of years' is the definition.
I can't judge whether this definition defines the answer.
'working in retail securing name' is the wordplay.
'working' indicates anagramming the letters.
'securing' is an insertion indicator.
'name' becomes 'n' (common abbreviation e.g. on forms).
'in'+'retail'='inretail'
'inretail' is an anagram of 'trienial'.
'trienial' placed around 'n' is 'TRIENNIAL'.
Can you help me to learn more?
(Other definitions for triennial that I've seen before include "Regularly occurring" , "Recurring every three years" , "lasting a few years" , "Occurring every three years" .)