Baseballer accepted enclosed area with hesitation (9)
I believe the answer is:
infielder
'baseballer' is the definition.
(I've seen this before)
'accepted enclosed area with hesitation' is the wordplay.
'accepted' becomes 'in' (I've seen this in other clues).
'enclosed area' becomes 'field' (someone's area of expertise. I am not sure about the 'enclosed' bit.).
'with' means one lot of letters go next to another.
'hesitation' becomes 'er' (sound made while hesitating - um, er).
'in'+'field'+'er'='INFIELDER'
Can you help me to learn more?
(Other definitions for infielder that I've seen before include "gully, perhaps" , "Baseballer" .)