Setter is a soldier on Nepalese border - visualise that! (7)

I believe the answer is:

imagine

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'visualise that' is the definition.
'imagine' can be an answer for 'visualise' (I've seen this in another clue). I'm unsure of the remainder of the definition.

'setter is a soldier on nepalese border' is the wordplay.
'setter is' becomes 'I'm' (the setter is the person who set the crossword).
'soldier' becomes 'GI' (term for US soldier).
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'border' suggests removing the centre (I've seen 'borders' mean this (only the edge or border letters remain)).
'nepalese' with its middle taken out is 'ne'.
'im'+'a'+'gi'+'ne'='IMAGINE'

Can you help me to learn more?

(Other definitions for imagine that I've seen before include "Suppose; conceive" , "Picture to oneself" , "Suspect" , "Form a mental image in the mind" , "Classic Lennon song" .)

I've seen this clue in The Irish Times.

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