Where people may be caught abroad with some grass (8)
I believe the answer is:
outfield
'where people may be caught' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'abroad with some grass' is the wordplay.
'abroad' becomes 'out' (abroad can mean away or out).
'with' says to put letters next to each other.
'some grass' becomes 'field' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'out'+'field'='OUTFIELD'
Can you help me to learn more?
(Other definitions for outfield that I've seen before include "Part of pitch furthest from wicket" , "Area furthest from the stumps" , "Area away from the wicket" , "Distant region of cricket ground" .)