Batsman, maybe, feeling more pain, having secured century (6)
I believe the answer is:
scorer
'batsman maybe' is the definition.
(a cricket batsman scores runs)
'feeling more pain having secured century' is the wordplay.
'feeling more pain' becomes 'sorer' (feeling sore can mean feeling pain).
'having secured' means one lot of letters goes inside another.
'century' becomes 'C' (common abbreviation).
'sorer' going around 'c' is 'SCORER'.
(Other definitions for scorer that I've seen before include "Cricket statistician" , "- e.g. 13 17 for 1A [PORTER-FIELD for SUNDERLAND]" , "One getting a goal" , "Cricket bookkeeper" , "who makes a point?" .)