Uriah upset about Victor is grumpy (7)
I believe the answer is:
peevish
'grumpy' is the definition.
(thesaurus)
'uriah upset about victor is' is the wordplay.
'uriah' becomes 'heep' (I've seen this in another clue).
'upset' shows that the letters should be reversed in order.
'about' is an insertion indicator.
'victor' becomes 'V' (phonetic alphabet: alpha, bravo, charlie etc.).
'heep' back-to-front is 'peeh'.
'v'+'is'='vis'
'peeh' placed around 'vis' is 'PEEVISH'.
(Other definitions for peevish that I've seen before include "Cranky, easily annoyed" , "Complaining - irritable" , "Easily irritated or annoyed" , "In irritable state" , "Showing an irritable disposition" .)