Encourage with a ghostly presence? (8)

I believe the answer is:

inspirit

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

'with a ghostly presence?' is the wordplay.
'with' means one lot of letters go next to another.
'a ghostly' becomes 'in' (I can't explain this - if you can you should give a lot more credence to this answer).
'presence?' becomes 'spirit' (presence is a kind of spirit).
'in'+'spirit' is 'INSPIRIT'.

Can you help me to learn more?

(Another definition for inspirit that I've seen is " Encourage, enliven".)

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