Back up investor in the end and pursue acquisition (8)
I believe the answer is:
purchase
'acquisition' is the definition.
(I know that purchase is a type of acquisition)
'back up investor in the end and pursue' is the wordplay.
'back' says the letters should be written backwards.
'in the end' suggests the final letters.
'and' is a charade indicator (letters next to each other).
'pursue' becomes 'chase' (chasing is a kind of pursuing).
The final letter of 'investor' is 'r'.
'up' back-to-front is 'pu'.
'pu'+'r'+'chase'='PURCHASE'
(Other definitions for purchase that I've seen before include "Leverage" , "become an owner" , "Firm grip" , "Spend some money" , "Pay money" .)