Backroom boy away in wine store (6)
I believe the answer is:
boffin
'backroom boy' is the definition.
(both can mean a scientist or researcher)
'away in wine store' is the wordplay.
'away' becomes 'off' (synonyms).
'in' indicates putting letters inside.
'wine store' becomes 'bin' (stand for storing wine bottles).
'off' going into 'bin' is 'BOFFIN'.
(Other definitions for boffin that I've seen before include "Research scientist" , "Scientist (informal)" , "Technical expert" , "Scientist (in the back room?)" , "Brainbox" .)