Speculation, perhaps, one will get new clothing (10)
I believe the answer is:
investment
'speculation perhaps' is the definition.
(speculation is a kind of investment)
'one will get new clothing' is the wordplay.
'one' becomes 'i' (Roman numeral).
'will get' is a charade indicator (letters next to each other).
'new' becomes 'n'.
'clothing' becomes 'vestment' (vestment is a kind of clothing**).
'i'+'n'+'vestment'='INVESTMENT'
(Other definitions for investment that I've seen before include "Something bought for later profit" , "something with value for future generations?" , "Money used to gain potential profit" , "Money laid out" , "Blockade; profitable use of money" .)