Fielder is a little short bloke (4)
I believe the answer is:
cove
'bloke' is the definition.
(both can informally mean a man)
'fielder is a little short' is the wordplay.
'fielder' becomes 'cover' (I've seen this before).
'is a little short' means to remove the last letter.
'cover' with its final letter taken off is 'COVE'.
(Other definitions for cove that I've seen before include "A small inlet or estuary" , "Small bay or slangy man" , "Sheltered accommodation" , "Small sheltered inlet" , "Sheltered bay, inlet" .)