Arranging asters looks hard (6)
I believe the answer is:
stares
'looks hard' is the definition.
(I've seen this before)
'arranging asters' is the wordplay.
'arranging' indicates an anagram.
'asters' with letters rearranged gives 'STARES'.
(Other definitions for stares that I've seen before include "Long gazes" , "Assert with long looks" , "Looks fixedly" , "Looks hard" , "Looks lengthily at" .)