Tense Truss in conversation on X (7)
I believe the answer is:
tighten
'tense truss in conversation on x' is the definition.
'tighten' can be an answer for 'tense' (I've seen this before). I am not certain of the 'truss in conversation on x' bit.
'tense truss in conversation on' is the wordplay.
'tense' becomes 'tight' (associated in meaning).
'truss in conversation' becomes 'en' (I am not sure about this - if you are sure you should believe this answer much more).
'on' means one lot of letters go next to another.
'tight'+'en'='TIGHTEN'
Can you help me to learn more?
(Other definitions for tighten that I've seen before include "Stiffen" , "Make more restrictive" , "Apply increased tension or security" , "Make more secure or tense" , "get tense" .)