Laid-back style of girl accepting cash card number? (6)
I believe the answer is:
supine
'laid-back' is the definition.
(I've seen this before)
'girl accepting cash card number?' is the wordplay.
'girl' becomes 'sue' (girl's name).
'accepting' means one lot of letters goes inside another (inserted letters are accepted).
'cash card number?' becomes 'PIN' (as in a PIN number on a bank card).
'sue' enclosing 'pin' is 'SUPINE'.
'style of' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for supine that I've seen before include "Recumbent" , "offering no resistance" , "Use pin (anag.)" , "Lethargic" , "Lying on one's back - passive" .)