Keep out of Soweto, we reckon (5)
I believe the answer is:
tower
'keep' is the definition.
(keep can mean a fortified structure)
'out of soweto we reckon' is the wordplay.
'out of' says the answer is hidden in the clue.
'TOWER' is hidden in the letters of 'soweto we reckon'.
(Other definitions for tower that I've seen before include "Campanile, spire etc" , "tugboat" , "Rise to great height" , "Minaret, for example" , "One drawing" .)