They remove unwanted bits as well with most of the selections (10)
I believe the answer is:
Here is my best explanation:
'they remove unwanted bits' is the definition.
'as well with most of the selections' is the wordplay.
'as well' becomes 'too' ('too' can be a synonym of 'as well').
'with' is a charade indicator (letters next to each other).
'most of' means to remove the last letter.
'selections' becomes 'picks' ('pick' can be a synonym of 'selection').
'the' with its final letter taken off is 'th'.