Cross I value (5)
I believe the answer is:
irate
'cross' is the definition.
(thesaurus)
'i value' is the wordplay.
'value' becomes 'rate' ('rate' can be a synonym of 'value').
'i'+'rate'='IRATE'
(Other definitions for irate that I've seen before include "Narked" , "ranting" , "having got in wax" , "Angry - furious" , "Angry, enraged" .)