To take up the post is to increase the risk (5,3,5)
 
                        
                    I believe the answer is:
raise the stake
'to take up' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'post is to increase the risk' is the wordplay.
'post' says to put letters next to each other (post- can mean after).
'is to increase' becomes 'raise' (I've seen this before).
'risk' becomes 'stake' (staking is a kind of risking).
'raise'+'the' is 'raisethe'.
'raisethe'+'stake'='RAISE THE STAKE'
'the' acts as a link.
Can you help me to learn more?
                                I've seen this clue in The Irish News and The Globe and Mail.
                            
                        
                    
                
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