Run section of haberdashery (4)
I believe the answer is:
dash
'run' is the definition.
(dash is a kind of run)
'section of haberdashery' is the wordplay.
'section of' indicates a hidden word.
'DASH' can be found hidden inside 'haberdashery'.
(Other definitions for dash that I've seen before include "Splash of colour" , "Discourage - suggestion - hurry" , "Morse code symbol" , "Punctuation mark; hurry" , "Hurry ("must ____!")" .)