Card held by bridge player in need of a partner? (6,5)
I believe the answer is:
lonely heart
'bridge player in need of a partner?' is the definition.
The definition suggests a singular noun which matches the answer.
'card held by' is the wordplay.
'card' becomes 'heart' (the hearts are a playing card suit).
'held' becomes 'lonely' (I can't justify this - if you can you should believe this answer much more).
'by' is a charade indicator (letters next to each other).
'heart' put after 'lonely' is 'LONELY HEART'.
Can you help me to learn more?
(Another definition for lonely heart that I've seen is " One seeking love".)