Missing leader speechless with anger and resentment (7)
I believe the answer is:
umbrage
'resentment' is the definition.
(I've seen this in another clue)
'missing leader speechless with anger' is the wordplay.
'missing leader' means to remove the first letter (leader meaning lead letter).
'speechless' becomes 'dumb' (synonyms).
'with' means one lot of letters go next to another.
'anger' becomes 'rage' (rage is a kind of anger).
'dumb' with its initial letter removed is 'umb'.
'umb'+'rage'='UMBRAGE'
'and' is the link.
(Other definitions for umbrage that I've seen before include "Displeasure" , "Feeling of anger caused by being offended" , "In high dudgeon" , "Indignation" , "Take this to show offence" .)