Sharp as tack primarily, you reportedly emptied treasure (6)
I believe the answer is:
astute
'sharp' is the definition.
(synonyms)
'as tack primarily you reportedly emptied treasure' is the wordplay.
'primarily' indicates taking the first letters.
'reportedly' indicates a 'sounds like' (homophone) clue.
'emptied' suggests removing the centre.
'treasure' with its middle removed is 'te'.
The initial letter of 'tack' is 't'.
'you' sounds like 'u'.
'as'+'t'+'u'+'te'='ASTUTE'
(Other definitions for astute that I've seen before include "Sharp and clever" , "Shrewd and clever" , "Wide" , "Having hardheaded intelligence" , "Perspicacious" .)