Scottish roots, born outside of Prestonpans (5)
I believe the answer is:
neeps
'scottish roots' is the definition.
(I've seen this before)
'born outside of prestonpans' is the wordplay.
'born' becomes 'nee' (I've seen this before).
'outside of' means to remove the middle letters.
'prestonpans' with its middle taken out is 'ps'.
'nee'+'ps'='NEEPS'
(Other definitions for neeps that I've seen before include "Root vegetables" , "Scottish roots" , "Scots turnips" , "Scottish turnips" .)