Resilience excited Ms Anita (7)
I believe the answer is:
stamina
'resilience' is the definition.
(I've seen this before)
'excited ms anita' is the wordplay.
'excited' indicates an anagram.
'ms'+'anita'='msanita'
'msanita' is an anagram of 'STAMINA'.
(Other definitions for stamina that I've seen before include "Ability for sustained effort" , "perseverance" , "capacity to endure" , "The ability to sustain prolonged physical or mental effort" , "toughness in > male parts" .)