Faced with an expert (3)
I believe the answer is:
ace
'an expert' is the definition.
(ace can informally mean very good)
'faced with' is the wordplay.
'with' indicates the answer is hidden within the clue.
'ACE' can be found hidden inside 'faced'.
(Other definitions for ace that I've seen before include "even higher than the king" , "Expert - winning serve" , "Expert (sl.)" , "Top playing card" , "Playing card with single spot" .)