Split — like some tennis courts (7)
I believe the answer is:
grassed
'split like some tennis courts' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs can occasionally define each other.
'split like' is the wordplay.
I cannot quite see how this works, but
'like' could be 'as' and 'as' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for grassed that I've seen before include "catch thus dropped" , "green?" , "Turfed - informed" , "Snitched, shopped" , "Gave away information" .)