Morose fellow in old store initially lacking scent (9)
I believe the answer is:
odourless
'morose fellow in old store initially lacking scent' is the definition.
I can't judge whether this defines the answer.
'morose fellow in old store' is the wordplay.
'morose' becomes 'dour' (synonyms).
'fellow' becomes 'les' (Les is a man's name).
'in' is an insertion indicator.
'old store' becomes 'os' (this might be a standard abbreviation I've not previously seen).
'dour'+'les'='dourles'
'dourles' placed inside 'os' is 'ODOURLESS'.
Can you help me to learn more?
(Other definitions for odourless that I've seen before include "Without smell" , "free from smell" , "devoid of smell" , "Unscented" , "having no hint of whiff" .)