It's extra tasteful (5)
I believe the answer is:
sauce
'extra tasteful' is the definition.
I can't tell whether this defines the answer.
'it's' is the wordplay.
I cannot quite understand how this works, but
'it' could be 'sa' (SA can mean sex appeal, as in 'it') and 'sa' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for sauce that I've seen before include "Impertinence; dressing" , "Informal impudence or food flavouring" , "'Hunger is the best . . . . .'" , "sharp language" , "Cause for relish" .)