Vet witnessed inspiring commander's limits (6)
I believe the answer is:
screen
'vet' is the definition.
(thesaurus)
'witnessed inspiring commander's limits' is the wordplay.
'witnessed' becomes 'seen' ('seen' can be similar in meaning to 'witnessed').
'inspiring' indicates putting letters inside.
'limits' suggests removing the centre.
'commander' with its middle removed is 'cr'.
'seen' placed around 'cr' is 'SCREEN'.
(Other definitions for screen that I've seen before include "Blind - hide from view" , "Cover - cinema" , "A film is projected onto it" , "Flat surface onto which images are projected" , "show on TV" .)