Required from kleptomaniac, a plan to return high-end fabric (6)
I believe the answer is:
alpaca
'high-end fabric' is the definition.
(fabric made from alpaca wool)
'required from kleptomaniac a plan to return' is the wordplay.
'required from' indicates the answer is hidden within the clue.
'to return' shows that the letters should be reversed in order.
'acapla' can be found hidden inside 'kleptomaniac a plan'.
'acapla' backwards is 'ALPACA'.
(Other definitions for alpaca that I've seen before include "Type of llama" , "S American mammal in the llama family" , "Type of wool" , "Woolly mammal" , "Fabric from wool of S American llama" .)