Selling no alcohol? Notice wood spirit (5)
I believe the answer is:
dryad
'wood spirit' is the definition.
(I've seen this before)
'selling no alcohol? notice' is the wordplay.
'selling no alcohol?' becomes 'dry' (dry can mean prohibiting the sale of alcohol).
'notice' becomes 'ad' (short for advert).
'dry'+'ad'='DRYAD'
(Other definitions for dryad that I've seen before include "Wood-nymph" , "Nymph of trees" , "Tree nymph" , "Beautiful young woman" , "Woodland nymph" .)