Has former PM tucked into hot South American breakfast dish? (4,6)
I believe the answer is:
hash browns
'american breakfast dish?' is the definition.
'has former pm tucked into hot south' is the wordplay.
'former pm' becomes 'brown' (Gordon Brown, British Prime Minister 2007-2010).
'tucked into' is an insertion indicator.
'hot' becomes 'h'.
'south' becomes 's' ('S' can be a synonym of 'south').
'h'+'s'='hs'
'brown' placed into 'hs' is 'hbrowns'.
'has'+'hbrowns'='HASH BROWNS'
(Other definitions for hash browns that I've seen before include "breakfast? Part of it, perhaps" , "potato dish" .)