Crossword Genius

That’s one way to keep the chaps away! (4,6)

Ross

I believe the answer is:

hand lotion

I'm a little stuck... Click here to teach me more about this clue!

'keep the chaps away' is the definition.
I can't tell whether this definition defines the answer.

'that's one way' is the wordplay.
I cannot really understand how this works, but
'one' could be 'an' (I've seen this in other clues) and 'an' is located in the answer.
'way' could be 'n' (Compass direction - North) and 'n' is found within the answer.
This explanation may well be incorrect...

'to' acts as a link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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