One or two animals in the field? (8)
I believe the answer is:
sheepdog
'one or two' is the definition.
I can't tell whether this definition defines the answer.
'animals in the field?' is the wordplay.
'animals' becomes 'sheep' (I have seen 'Woolly animals ' mean 'sheep' so perhaps 'animals' could also mean 'sheep').
'in the field?' becomes 'dog' (I can't explain this - if you can you should believe this answer much more).
'sheep'+'dog'='SHEEPDOG'
(Other definitions for sheepdog that I've seen before include "Canine trained to control flock" , "could it be Old English?" , "One drives over fields" , "Farmer's herding helper" , "Collie, for example" .)