Animal occupying English lea collapsing on the ground (7)
I believe the answer is:
epigeal
'on the ground' is the definition.
(I've seen this before)
'animal occupying english lea collapsing' is the wordplay.
'animal' becomes 'pig' (pigs are animals).
'occupying' indicates putting letters inside (inserted letters occupy or enter the word).
'english' becomes 'e' (abbreviation).
'collapsing' is an anagram indicator.
'e'+'lea'='elea'
'elea' anagrammed gives 'eeal'.
'pig' inserted within 'eeal' is 'EPIGEAL'.
(Another definition for epigeal that I've seen is " On the ground".)