No Scottish firm raised a lot (5)
I believe the answer is:
ocean
'a lot' is the definition.
(I have seen 'lot of liquid' mean 'ocean' so perhaps 'lot' could also mean 'ocean')
'no scottish firm raised' is the wordplay.
'no scottish' becomes 'nae' ('no' in Scottish dialect).
'firm' becomes 'co' (a firm is a company).
'raised' says the letters should be written backwards (going up in a down clue).
'nae'+'co'='naeco'
'naeco' written backwards gives 'OCEAN'.
(Other definitions for ocean that I've seen before include "Large expanse of sea" , "A mighty sea" , "Immense expanse or quantity" , "Pacific, perhaps" , "lot of liquid" .)