One who's out for blood, on the pitch? (7,3)
I believe the answer is:
vampire bat
'one who's out for blood on the pitch?' is the definition.
I can't tell whether this defines the answer.
'one who's out for blood on the pitch?' is the wordplay.
'one who's out for blood' becomes 'vampire' (I've seen this in another clue).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'the pitch?' becomes 'bat' (I am not sure about this - if you are sure you should believe this answer much more).
'vampire'+'bat'='VAMPIRE-BAT'
Can you help me to learn more?
(Another definition for vampire bat that I've seen is " Nocturnal bloodsucker".)