Show the den I contrived to trap one animal in (8)
I believe the answer is:
Here is my best explanation:
'show' is the definition.
('indicate' can be a synonym of 'show')
'the den i contrived to trap one animal in' is the subsidiary indication.
'contrived' indicates anagramming the letters.
'to trap' is an insertion indicator.
'one' becomes 'i' (roman numeral).
'animal' becomes 'cat' (I've seen this in other clues**).
'in' means one lot of letters goes inside another.
'deni' with letters rearranged gives 'inde'.
'inde' enclosing 'i' is 'indie'.
'indie' going around 'cat' is 'indicate'.
(Other definitions for indicate that I've seen before include "Signal or point to", "Point out, make known", "Point, show, signal", "Make a signal", "Show, point", "(Give a) signal", "Point out or give some notion of" and "Point out, suggest".)