Greeting KL native of great height (9)
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I believe the answer is:
himalayan
'of great height' is the definition.
(the Himalayas are a mountain range)
'greeting kl native' is the wordplay.
'greeting' becomes 'hi' (hi is a kind of greeting).
'kl native' becomes 'Malayan' (Kuala Lumpur is the capital of Malaysia).
'hi'+'malayan'='HIMALAYAN'
(Other definitions for himalayan that I've seen before include "Of a South Asian mountain range" , "from area of highest population" , "Like some mountains" , "Of the mountains between India and Tibet" , "in highest position in Asia" .)