Hear a rattle trap was ark's resting place (6)
I believe the answer is:
ararat
'ark's resting place' is the definition.
(I've seen this before)
'hear a rattle trap' is the wordplay.
'trap' indicates a hidden word (I've seen 'trapped' mean this).
'ARARAT' is hidden within 'hear a rattle'.
'was' acts as a link.
(Other definitions for ararat that I've seen before include "Biblical mountain" , "Mount where Noah's Ark came to rest" , "Ark's supposed resting place" , "Biblical mount" , "Noah's ark mountain" .)