Footloose Mark about to commit wrong with one female. Great! (8)
I believe the answer is:
terrific
'great' is the definition.
(I've seen this before)
'footloose mark about to commit wrong with one female' is the wordplay.
I cannot really see how this works, but
'about' could be 'c' (abbreviation for 'circa') and 'c' is located in the answer.
'wrong' could be 'err' and 'err' is present in the answer.
'one' could be 'i' (roman numeral) and 'i' is found within the answer.
'female' could be 'f' (abbreviation) and 'f' is found within the answer.
The remaining letters 'ti' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for terrific that I've seen before include "Excellent (colloq.)" , "Very intense" , "wicked" , "Fantastic, really great" , "Fit crier being excellent" .)