Selection in cooker (5)
I believe the answer is:
range
This clue is a double definition.
'selection' is the first definition.
(I've seen this before)
'cooker' is the second definition.
(I've seen this in other clues)
'in' is the link.
(Other definitions for range that I've seen before include "Old-style cooking stove" , "Variation within limits" , "Scope (for target practice?)" , "Open land for livestock in the US" , "Breadth (of variation)" .)