Poet from Spain on first (7)
I believe the answer is:
elegist
'poet' is the definition.
(elegist is a kind of poet)
'spain on first' is the wordplay.
'spain' becomes 'e' (abbreviation for Espana).
'on' becomes 'leg' (cricket term, fielding positions).
'first' becomes 'ist'.
'e'+'leg'+'ist'='ELEGIST'
'from' is the link.
(Other definitions for elegist that I've seen before include "bemoaning linesman" , "one wrote mournfully" , "serious linesman" , "Mournful poet" , "Gloomy poet" .)