Skittish due to full pay settlement (7)
I believe the answer is:
playful
'skittish' is the definition.
(thesaurus)
'full pay settlement' is the wordplay.
'settlement' is an anagram indicator.
'full'+'pay'='fullpay'
'fullpay' with letters rearranged gives 'PLAYFUL'.
'due to' is the link.
(Other definitions for playful that I've seen before include "Lively" , "Frisky" , "Fun-loving" , "In high spirits" , "Teasing, unserious" .)