Almost arrived before one with only this to wear! (8)
I believe the answer is:
camisole
'this to wear' is the definition.
(camisole is a kind of wear)
'almost arrived before one with only' is the wordplay.
'almost' means to remove the last letter (most of the word but not all of it).
'arrived' becomes 'came' (coming is a kind of arriving).
'before one' becomes 'i' (Roman numeral. I am not sure about the 'before' bit.**).
'with' means one lot of letters go next to another.
'only' becomes 'sole' ('sole' can be a synonym of 'only').
'came' with its last letter taken away is 'cam'.
'cam'+'i'+'sole'='CAMISOLE'
Can you help me to learn more?
(Other definitions for camisole that I've seen before include "Slip" , "Short undergarment for women" , "Item of lingerie" , "Top" , "Loose undergarment" .)