One wears silver kind of skirt on number of fields (8)
I believe the answer is:
agrarian
'of fields' is the definition.
(agrarian means relating to agriculture)
'one wears silver kind of skirt on number' is the wordplay.
'one' becomes 'I' (Roman numeral).
'wears' means one lot of letters goes inside another.
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'kind of skirt' becomes 'rara' (ra-ra skirt).
'on number' becomes 'n' (n can represent any number. I am not sure about the 'on' bit.).
'ag'+'rara'='agrara'
'i' going inside 'agrara' is 'agraria'.
'agraria'+'n'='AGRARIAN'
(Other definitions for agrarian that I've seen before include "Land reformer" , "Relating to farmland" , "of countryside" , "in the country" , "Ruralist" .)