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

'that's one way to keep the chaps away' is the definition.
I can't judge whether this definition defines the answer.

'that's one way to keep the' is the wordplay.
I cannot really see how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is located in the answer.
'way' could be 'n' (Compass direction - North) and 'n' is present in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?