Hard turf offered up for cash (4)
I believe the answer is:
dosh
'for cash' is the definition.
(dosh can informally mean money)
'hard turf offered up' is the wordplay.
'hard' becomes 'h' (abbreviation used in pencil classifications).
'turf' becomes 'sod' (synonyms).
'offered up' says the letters should be written backwards.
'h'+'sod'='hsod'
'hsod' written backwards gives 'DOSH'.
(Other definitions for dosh that I've seen before include "Contents of purse" , "Ready" , "cash" , "currency" , "Money (sl.)" .)