Shot bound at any time to be heard (9)
I believe the answer is:
endeavour
'shot' is the definition.
(both can mean an attempt)
'bound at any time to be heard' is the wordplay.
I cannot quite understand how this works, but
'bound' could be 'end' (end is a kind of bound) and 'end' is found within the answer.
This explanation may well be incorrect...
(Other definitions for endeavour that I've seen before include "Strive - over a nude (anag)" , "Aim" , "Enterprise; earnest effort" , "Try - Captain Cook's vessel" , "Morse" .)