Small share of profits for what's at risk? (5)
I believe the answer is:
stake
I believe this clue is a double definition.
'small share of profits' is the first definition.
(eg a stake in a business)
'what's at risk?' is the second definition.
(eg in a poker game)
'for' acts as a link.
(Other definitions for stake that I've seen before include "Share (in a business); post" , "Deposit as a wager" , "Ante, bet" , "Amount wagered" , "Prize" .)