The senior of two fielders (5)
I believe the answer is:
elder
'the senior' is the definition.
(synonyms)
'of two fielders' is the wordplay.
'two fielders' means two substitutions for 'fielders'.
'of' says the answer is hidden in the clue.
'ELDER' is hidden in the letters of 'fielders fielders'.
(Other definitions for elder that I've seen before include "Tie up" , "Berry-bearing shrub" , "Senior - presbyter" , "one with roots" , "Character of church" .)