Enough to taste without needing seconds (5)
I believe the answer is:
ample
'enough' is the definition.
(ample means enough or plenty)
'taste without needing seconds' is the wordplay.
'taste' becomes 'sample' (sample can mean to taste or try).
'without needing' indicates named letters should be taken away.
'seconds' becomes 's' (abbreviation).
'sample' with 's' removed is 'AMPLE'.
'to' is the link.
(Other definitions for ample that I've seen before include "Quite sufficient, more than enough" , "Plentiful, quite enough" , "Large enough" , "Adequate" , "Generous" .)