Aussie bouncers? Opener in trouble bats here! (5)
I believe the answer is:
roost
'bats here' is the definition.
(place where bats rest)
'aussie bouncers? opener in trouble' is the wordplay.
'aussie bouncers?' becomes 'roos' (short for kangaroos, animals which bounce).
'opener in' suggests taking the first letters (I've seen 'openers in' mean this (the letters which open the words)).
The initial letter of 'trouble' is 't'.
'roos'+'t'='ROOST'
(Other definitions for roost that I've seen before include "Perch where bird sleeps" , "(Bird) settle for night" , "It's sometimes ruled" , "settle for a nap" , "Place on which bird rests" .)