Tries out, not good to squeeze bottom (9)
I believe the answer is:
posterior
'bottom' is the definition.
(synonyms)
'tries out not good to squeeze' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'not good' becomes 'poor' (I've seen this in another clue).
'to squeeze' is an insertion indicator (inserted letters are squeezed inside).
'tries' anagrammed gives 'steri'.
'steri' inserted within 'poor' is 'POSTERIOR'.
(Other definitions for posterior that I've seen before include "Hindquarters" , "Rear" , "later" , "Stern" , "Further back; bottom" .)