Red card leads to another frank exchange (5-2-5)
I believe the answer is:
heart-to-heart
'frank exchange' is the definition.
'heart to heart' can be an answer for 'frank' (I've seen this before). I am not certain of the 'exchange' bit.
'red card leads to another' is the wordplay.
'red card' becomes 'heart' (hearts are red in a deck of cards).
'leads' is a charade indicator (letters next to each other).
'another' becomes 'heart' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'heart'+'to'+'heart'='HEART-TO-HEART'
Can you help me to learn more?
(Other definitions for heart-to-heart that I've seen before include "Intimate conversation" , "Intimate talk" , "Candid conversation" .)