What you wouldn’t expect for a quid? (5)
I believe the answer is:
twist
I believe this is a double definition.
'what you wouldn't expect' is the first definition.
(eg a twist in a film)
'quid?' is the second definition.
(thesaurus)
'for a' is the link.
(Other definitions for twist that I've seen before include "Sixties dance; cheat" , "Distort; apply torque" , "Rick" , "Dance; defraud" , "workhouse child" .)