Begin by taking round to the fold (4)
I believe the answer is:
open
'begin' is the definition.
(opening is a kind of begining)
'by taking round to the fold' is the wordplay.
'by' is a charade indicator (letters next to each other).
'taking round' becomes 'o' (round can mean a round object. I am not sure about the 'taking' bit.).
'to the fold' becomes 'pen' (both can mean an animal enclosure).
'o'+'pen' is 'OPEN'.
Can you help me to learn more?
(Other definitions for open that I've seen before include "Exposed; free" , "Start - frank" , "gaping" , "sporting competition" , "Undo; ajar" .)