Physician is about to peregrinate with a stockman (6)
I believe the answer is:
drover
'stockman' is the definition.
(I know that drover is a type of rancher)
'physician is about to peregrinate' is the wordplay.
'physician' becomes 'Dr' (synonyms).
'is about' is an insertion indicator.
'to peregrinate' becomes 'rove' (I've seen this in another clue).
'dr' going around 'rove' is 'DROVER'.
'with a' acts as a link.
(Other definitions for drover that I've seen before include "Cattle hand" , "One driving flock to market" , "Herdsman" , "Man who herds cattle" , "One driving cattle" .)