Sharpen a pen and show candour (7)

I believe the answer is:

honesty

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'show candour' is the definition.
'honesty' can be an answer for 'candour' (I've seen this before). I am unsure of the 'show' bit.

'sharpen a pen' is the wordplay.
'sharpen' becomes 'hone' (honing is a kind of sharpening).
'a pen' becomes 'sty' (both can mean an animal enclosure).
'hone'+'sty'='HONESTY'

'and' is the link.

Can you help me to learn more?

(Other definitions for honesty that I've seen before include "Integrity" , "It's said to be the best policy" , "Plant; truthfulness" , "that's easily cultivated" , "Straightforwardness" .)

I've seen this clue in The Globe and Mail.

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