One digs up some chrysanthemum in error (5)
I believe the answer is:
miner
'one digs up' is the definition.
(someone who digs)
'some chrysanthemum in error' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'MINER' can be found hidden inside 'chrysanthemum in error'.
(Other definitions for miner that I've seen before include "One who digs for ore" , "Person who works underground" , "it's the pits, for me" , "Underground labourer" , "Pitman" .)