Virtuous man on field that's foreign (7)
I believe the answer is:
strange
'foreign' is the definition.
(similar in meaning)
'virtuous man on field' is the wordplay.
'virtuous man' becomes 'st' (short for saint).
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'field' becomes 'range' (I've seen this in other clues).
'st'+'range'='STRANGE'
'that's' acts as a link.
(Other definitions for strange that I've seen before include "Unusual, odd" , "Curious" , "Surreal" , "Odd or unknown" , "Bizarre" .)