Charming king ignored by mountain climber (5,3)

I believe the answer is:

sweet pea

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'climber' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for sweet pea that I've seen before include "Pew tease (anag) - flower" , "Climbing pant" , "Highly-scented garden climber" , "Celestial source of fluctuating radio waves" , "Climbing plant with pastel-coloured flowers" .)

I've seen this clue in The Independent.

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