Stay in order to see well-camouflaged creature (5,6)
I believe the answer is:
stick insect
'well-camouflaged creature' is the definition.
'stay in order' is the wordplay.
'stay' becomes 'stick' (synonyms).
'order' becomes 'sect' (I've seen this in other clues).
'stick'+'in'+'sect'='STICK-INSECT'
'to see' acts as a link.
(Other definitions for stick insect that I've seen before include "Bug that's noted for camouflage" , "Thin person" , "creature hard to spot in tree" , "Its body has virtually no substance" , "Its limbs look like twigs" .)