Left page in range of investments (9)
I believe the answer is:
portfolio
'range of investments' is the definition.
(I've seen this before)
'left page' is the wordplay.
'left' becomes 'port' (left side of a ship - opposite of starboard).
'page' becomes 'folio' (I've seen this before).
'port'+'folio'='PORTFOLIO'
'in' acts as a link.
(Other definitions for portfolio that I've seen before include "art collection" , "Cabinet responsibility" , "What Secretary of State was appointed to" , "governmental responsibility" , "Set of investments held by one person" .)