Credit cuts all the same, flipping cheek! (8)
I believe the answer is:
temerity
'cheek' is the definition.
(I've seen this before)
'credit cuts all the same flipping' is the wordplay.
'credit' becomes 'merit' (I've seen this before).
'cuts' means one lot of letters goes inside another (some letters cut their way into other letters).
'all the same' becomes 'yet' (I've seen this before).
'flipping' is a reversal indicator.
'yet' back-to-front is 'tey'.
'merit' put into 'tey' is 'TEMERITY'.
(Other definitions for temerity that I've seen before include "Brashness or rashness" , "Yet merit may lead to rashness" , "Boldness, audacity" , "Front" , "Rashness, unreasonable contempt for danger" .)