Try to sell field (5)
I believe the answer is:
pitch
I believe this clue is a double definition.
'try to sell' is the first definition.
(as in giving a pitch)
'field' is the second definition.
(I know that pitch is a type of field)
(Other definitions for pitch that I've seen before include "Hurl" , "Sales talk - where games are played" , "Tar; toss" , "Cricket-playing area" , "lurch about in the waves?" .)