Branch of a Worcester pearmain (3)
I believe the answer is:
arm
'branch' is the definition.
(synonyms)
'of a worcester pearmain' is the wordplay.
'of' indicates the answer is hidden within the clue.
'ARM' can be found hidden inside 'worcester pearmain'.
(Other definitions for arm that I've seen before include "Human limb" , "Activate warhead" , "Equip with weapons" , "Equip with a limb" , "Maybe rifle" .)