Is sure to have pointed ears! (6)

I believe the answer is:

swears

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'is sure to' is the definition.
I can't tell whether this definition defines the answer.

'pointed ears' is the wordplay.
'pointed' becomes 'sw' (I can't explain this - if you can you should give a lot more credence to this answer).
'sw'+'ears'='SWEARS'

'have' acts as a link.

Can you help me to learn more?

(Other definitions for swears that I've seen before include "Takes oath or curses" , "Quite (mus.); a female voice" , "Blinds" , "Curses or pledges" , "Takes oath or utters imprecation (6)" .)

I've seen this clue in the Evening Standard.

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