A bridge partnership wonder (3)
I believe the answer is:
awe
'wonder' is the definition.
(awe is a kind of wonder)
'a bridge partnership' is the wordplay.
'bridge partnership' becomes 'WE' (West and East are partners in the card game bridge).
'a'+'we'='AWE'
(Other definitions for awe that I've seen before include "Amazed wonder" , "A mix of fear and wonder" , "Fear; reverence" , "Feeling of fear and wonder" , "Reverent fear" .)