Appreciates marks on wicket, batting first (9)
I believe the answer is:
increases
'appreciates' is the definition.
(appreciate can mean to increase in value)
'marks on wicket batting first' is the wordplay.
'marks on wicket' becomes 'creases' (cricket term).
'batting' becomes 'in'.
'first' is a charade indicator (letters next to each other).
'creases' after 'in' is 'INCREASES'.
(Other definitions for increases that I've seen before include "Gets bigger" , "Becomes greater" , "Becomes bigger" .)