See returning ambassador dashing around (6)
I believe the answer is:
behold
'see' is the definition.
(I know that behold is a type of see)
'returning ambassador dashing around' is the wordplay.
'returning' is a reversal indicator.
'ambassador' becomes 'he' (His or Her Excellency).
'dashing' becomes 'bold' (I've seen this in another clue).
'around' means one lot of letters goes inside another.
'he' written backwards gives 'eh'.
'eh' going within 'bold' is 'BEHOLD'.
(Other definitions for behold that I've seen before include "Lo, see here" , "Archaic word for see or observe" , "See! Look!" , "Archaic injunction to look" , "Archaic injunction to observe" .)