Dogged batting with little sibling in front of pavilion (9)
I believe the answer is:
insistent
'dogged' is the definition.
(thesaurus)
'batting with little sibling in front of pavilion' is the wordplay.
'batting' becomes 'in' (as in batting or being 'in' in cricket).
'with' is a charade indicator (letters next to each other).
'little sibling' becomes 'sis' (short for sister).
'in front of' says to put letters next to each other.
'pavilion' becomes 'tent' (I've seen this in another clue).
'in'+'sis'+'tent'='INSISTENT'
(Other definitions for insistent that I've seen before include "Emphatic" , "Refusing to be thwarted" , "Compelling attention" , "Constant" , "Unwilling to take "no" for an answer" .)