Crossword Genius

It's a stretch to get privates on the ground (3,6)

Ross

I believe the answer is:

the splits

'it's a stretch to get privates' is the definition.
I can't judge whether this definition defines the answer.

'on the ground' is the wordplay.
'on' means one lot of letters go next to another.
'ground' becomes 'splits' (I can't justify this - if you can you should believe this answer much more).
'the'+'splits' is 'THE SPLITS'.

I've seen this clue in The Guardian.
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