from The Century Dictionary.
- Resembling or pertaining to grocers; carrying on the grocers' trade.
Sorry, no etymologies found.
One could see that he was shaken out of his usual grocerly calm, for his feverish hand was stroking a cat where no cat was.
Living Alone Stella Benson 1912
One thing Bertha noticed was that, though the grocer invariable addressed her mother as "madam," in speaking to _her_ he never used the grocerly "miss" and when, by chance, she heard him bestow this objectionable title upon a servant girl who was making purchases at the same time, Bertha not only felt grateful for the distinction, but saw in it a fresh proof of Mr. Jollyman's good breeding.
Will Warburton George Gissing 1880