Professional cheat slyly ensnares most lovely girl at last (9)
I believe the answer is:
technical
'professional' is the definition.
(thesaurus)
'cheat slyly ensnares most lovely girl at last' is the wordplay.
I cannot really understand how this works, but
'girl' could be 'cal' and 'cal' is present in the answer.
'last' could be 't' (I've seen this in other clues) and 't' is found in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for technical that I've seen before include "Using specialised skill" , "Industrial" , "as per strict rules" , "Relating to mechanical art or applied science" , "requires special skill" .)