Tried the first dates out (6)
I believe the answer is:
tasted
'tried' is the definition.
('taste' can be a synonym of 'try')
'the first dates out' is the wordplay.
'the first' becomes 't' (1st letter of 'the').
'out' is an anagram indicator (out can mean wrong or inaccurate).
'dates' with letters rearranged gives 'asted'.
't'+'asted'='TASTED'
(Other definitions for tasted that I've seen before include "Sampled the flavour" , "Tried for flavour" , "Samples" , "Sampled (a food/drink)" , "Sampled (food)" .)