Tried finishing breakfast with fresh dates (6)
I believe the answer is:
tasted
'tried' is the definition.
('taste' can be a synonym of 'try')
'finishing breakfast with fresh dates' is the wordplay.
'finishing' indicates one should take the final letters (the letter which finishes the word).
'with' says to put letters next to each other.
'fresh' indicates an anagram (a fresh re-ordering of the letters).
The final letter of 'breakfast' is 't'.
'dates' is an anagram of 'asted'.
't'+'asted'='TASTED'
(Other definitions for tasted that I've seen before include "Sampled (food)" , "Tested the flavour" , "Savoured" , "Sampled the flavour" , "Tried for flavour" .)