Shopkeeper bursting into tears (9)
I believe the answer is:
stationer
'shopkeeper' is the definition.
(I've seen this before)
'bursting into tears' is the wordplay.
'bursting' indicates an anagram.
'into'+'tears'='intotears'
'intotears' anagrammed gives 'STATIONER'.
(Other definitions for stationer that I've seen before include "Seller of writing materials" , "source of writing materials" , "One assigning position" , "I supply rulers: for example" , "Tears into (anag.)" .)