Object of worship in orchidology (4)
I believe the answer is:
idol
'object of worship' is the definition.
(I've seen this before)
'in orchidology' is the wordplay.
'in' says the answer is hidden in the clue.
'IDOL' can be found hidden inside 'orchidology'.
(Other definitions for idol that I've seen before include "Honoured figure" , "Figure of worship" , "Effigy" , "Darling" , "Worshipped statue" .)