Is frightened knight overwhelmed by marauding crusaders? (4,6)

'is frightened' is the definition.
(to run scared is to show fear)

'knight overwhelmed by marauding crusaders?' is the wordplay.
'knight' becomes 'n' (chess abbreviation).
'overwhelmed by' means one lot of letters goes inside another (inserted letters get absorbed or overwhelmed).
'marauding' indicates an anagram.
'crusaders' is an anagram of 'russcared'.
'n' inserted inside 'russcared' is 'RUNS SCARED'.