Frank girl coming out with appeal for regular transfer (6,5)
I believe the answer is:
direct debit
'regular transfer' is the definition.
'frank girl coming out with appeal' is the wordplay.
'frank' becomes 'direct' ('direct' can be similar in meaning to 'frank').
'girl coming out' becomes 'deb' (short for debutante).
'with' is a charade indicator (letters next to each other).
'appeal' becomes 'it'.
'direct'+'deb'+'it'='DIRECT DEBIT'
'for' acts as a link.
(Other definitions for direct debit that I've seen before include "Banking payment option" , "way to make payments?" , "Payment transfer arrangement" , "Way of paying regular bills" .)