Left at the crease doubled up, player upset about that (9)
I believe the answer is:
remaining
'left' is the definition.
(I know that left can be written as remaining)
'at the crease doubled up player upset about that' is the wordplay.
'at the crease' becomes 'in' (cricket term).
'doubled up' says to double the letters.
'player' becomes 'gamer' (I've seen this in another clue).
'upset' says the letters should be written in reverse.
'about that' is an insertion indicator.
'gamer' written backwards gives 'remag'.
'in' duplicated is 'inin'.
'inin' placed inside 'remag' is 'REMAINING'.
(Other definitions for remaining that I've seen before include "Residual" , "Surviving" , "still here" , "Staying" , "Left" .)