X installed by techie (3)
I believe the answer is:
chi
'x' is the definition.
(I've seen this before)
'installed by techie' is the wordplay.
'CHI' is hidden within the letters.
But, I am uncertain how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for chi that I've seen before include "Classical symbol" , "Greek letter; Chinese life force" , "Greek X" , "Letter written by European" , "T'ai -, martial art" .)