Extent of place to practise shooting (5)
I believe the answer is:
range
This clue is a double definition.
'extent' is the first definition.
(range is a kind of extent)
'place to practise shooting' is the second definition.
'of' is the link.
(Other definitions for range that I've seen before include "Series of connected mountains" , "1 across [CLASSIFY]" , "specific category" , "Mountain chain" , "Oven" .)