Many blokes will swallow large, ultimately fraudulent plot (9)
I believe the answer is:
allotment
'plot' is the definition.
(I've seen this before)
'many blokes will swallow large ultimately fraudulent' is the wordplay.
'many' becomes 'alot' (a lot of something).
'blokes' becomes 'men' (bloke can informally mean a man).
'will swallow' indicates putting letters inside.
'large' becomes 'L' (eg in clothes sizes).
'ultimately' suggests the final letters.
The final letter of 'fraudulent' is 't'.
'alot'+'men'='alotmen'
'alotmen' going around 'l' is 'allotmen'.
'allotmen'+'t'='ALLOTMENT'
(Other definitions for allotment that I've seen before include "grant?" , "Piece of land let out for cultivation" , "Plot of land rented for growing vegetables" , "Where vegetables may be produced" , "Portion, distribution" .)