It tastes as good as new! (4)
I believe the answer is:
mint
'new' is the definition.
(thesaurus)
'it tastes as good' is the wordplay.
I cannot really see how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is present in the answer.
'as' could be 'in' (I've seen this in other clues) and 'in' is found within the answer.
A single letter 'm' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
'as' is the link.
Can you help me to learn more?
(Other definitions for mint that I've seen before include "Where money is made by the government" , "Place where metal money is made" , "Vast sum of money" , "Coinage producer" , "Place authorised to make a country's coins" .)