Try and use new business guarantee (6)
I believe the answer is:
surety
'business guarantee' is the definition.
'surety' can be an answer for 'guarantee' (surety is a kind of guarantee). I am unsure of the 'business' bit.
'try and use new' is the wordplay.
'and' says to put letters next to each other.
'new' is an anagram indicator.
'try' put after 'use' is 'usetry'.
'usetry' anagrammed gives 'SURETY'.
Can you help me to learn more?
(Other definitions for surety that I've seen before include "It's given as a guarantee that an obligation will be met" , "Warranty, guarantee" , "Security - guarantee" , "Money given as guarantee of action" , "Legal safeguard against loss" .)