Promise Victor it hurts (3)
I believe the answer is:
vow
'promise' is the definition.
(I've seen this before)
'victor it hurts' is the wordplay.
'victor' becomes 'V' (phonetic alphabet: alpha, bravo, charlie etc.).
'it hurts' becomes 'ow' (exclamation of pain).
'v'+'ow'='VOW'
(Other definitions for vow that I've seen before include "Solemn pledge" , "Binding promise" , "Plight" , "Promise, swear" , "Pledge, take oath" .)