Saturate large part of battlefield ending in bog (8)
I believe the answer is:
waterlog
'saturate' is the definition.
(I've seen this in another clue)
'large part of battlefield ending in bog' is the wordplay.
I cannot really see how this works, but
'large' could be 'l' (eg in clothes sizes) and 'l' is found within the answer.
'part' could be 'te' (te is a kind of part) and 'te' is found in the answer.
'of' could be 'o' and 'o' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for waterlog that I've seen before include "Thoroughly saturate" , "Soak" , "Become saturated" .)