Tries in physical practice (9)
I believe the answer is:
rehearsal
'practice' is the definition.
(rehearsal is a kind of practice)
'tries in physical' is the wordplay.
'tries' becomes 'hears' ('hear' can be a synonym of 'try').
'in' means one lot of letters goes inside another.
'physical' becomes 'real' (I've seen this in other clues).
'hears' inserted into 'real' is 'REHEARSAL'.
(Other definitions for rehearsal that I've seen before include "Dry run" , "Dramatic practice" , "Drill" , "Practice in theatre etc" , "Play run-through" .)