Decides to have stewed eels at court, with a bit of salad (7)
I believe the answer is:
'decides' is the definition.
(selecting is a kind of deciding)
'stewed eels at court with a bit of salad' is the wordplay.
'stewed' is an anagram indicator.
'at' means one lot of letters go next to another.
'court' becomes 'ct' (abbreviation used in road names).
'with' says to put letters next to each other.
'a bit of' indicates taking the first letters.
The first letter of 'salad' is 's'.
'eels' with letters rearranged gives 'sele'.
'to have' acts as a link.
(Other definitions for selects that I've seen before include "Chooses" , "Blocks" , "Picks out" .)