Ruse that helps player secure contract (5)
I believe the answer is:
trick
'ruse' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for trick that I've seen before include "Subterfuge" , "Stratagem - part of card play" , "Fool" , "Deception or illusion" , "Hoax; knack" .)