Greek character inside local pharmacy (5)
I believe the answer is:
alpha
'greek character' is the definition.
(letter from the Greek alphabet)
'inside local pharmacy' is the wordplay.
'inside' says the answer is hidden in the clue.
'ALPHA' is hidden in the letters of 'local pharmacy'.
(Other definitions for alpha that I've seen before include "- - and Omega" , "Dominant" , "Leading Greek character" , "star outshining the others" , "Foremost" .)