Person setting up fashionable store, initially less creditworthy? (9)

'person setting up' is the definition.
I can't tell whether this defines the answer.

'fashionable store initially less creditworthy?' is the wordplay.
'fashionable' becomes 'in' (in can mean fashionable or trendy).
'initially' indicates taking the first letters.
'less creditworthy?' becomes 'taller' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The initial letter of 'store' is 's'.
'in'+'s'+'taller'='INSTALLER'

Can you help me to learn more?