Pick out Celt after first bits of Scot's English (6)
I believe the answer is:
select
'pick' is the definition.
(I've seen this in another clue)
'out celt after first bits of scot's english' is the wordplay.
'out' indicates an anagram.
'after' says to put letters next to each other.
'first bits of' says to take the initial letters (I've seen 'first bit' mean this).
The first letters of 'scots english' is 'se'.
'celt' anagrammed gives 'lect'.
'lect' after 'se' is 'SELECT'.
(Other definitions for select that I've seen before include "Choose from several" , "Choose from a number of alternatives" , "Carefully chosen; choose" , "Choose, being special" , "Choice, picked out" .)