Arm art, for short (3)
I believe the answer is:
tat
'arm art for short' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tat that I've seen before include "What you get for tit" , "Tawdry things" , "Utterly tasteless objects" , "Inferior articles" , "Make lace using a small shuttle" .)