Reprimand Cairo poet appearing regularly in court (6)
I believe the answer is:
carpet
'reprimand' is the definition.
(thesaurus)
'cairo poet appearing regularly in court' is the wordplay.
'appearing regularly' means one should take alternating letters.
'in' indicates putting letters inside.
'court' becomes 'ct'.
'cairo'+'poet'='cairopoet'
The alternate letters of 'cairopoet' are 'arpe'.
'arpe' inserted inside 'ct' is 'CARPET'.
(Other definitions for carpet that I've seen before include "Floor cover" , "On the ......- getting a ticking-off" , "The red one is for VIPs" , "Slate" , "Flooring fabric" .)