Cut Mike? That hurts! (3)
I believe the answer is:
mow
'cut' is the definition.
(as in mowing a lawn)
'mike? that hurts' is the wordplay.
'mike?' becomes 'M' (phonetic alphabet: alpha, bravo, charlie etc.).
'that hurts' becomes 'ow!'.
'm'+'ow'='MOW'
(Other definitions for mow that I've seen before include "Cut grass on lawn" , "Cut grass or grain" , "Cut (e.g. grass)" , "Cut down, usually grass" , "Scythe" .)