Caught breaking genuine suspension of hostilities (5)
I believe the answer is:
truce
'suspension of hostilities' is the definition.
(I've seen this in another clue)
'caught breaking genuine' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'breaking' means one lot of letters goes inside another.
'genuine' becomes 'true' (associated in meaning).
'c' placed inside 'true' is 'TRUCE'.
(Other definitions for truce that I've seen before include "Temporary halt in hostilities" , "barley" , "Agreement to stop fighting temporarily" , "Agreed break in hostilities" , "Agreement to stop battle" .)