It's grand in raw being prompt (5)

I believe the answer is:

nudge

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

'it's grand in raw' is the wordplay.
'it's grand' becomes 'g' (G is short for grand as in a thousand).
'in' is an insertion indicator.
'raw' becomes 'nude' (I am not sure about this - if you are sure you should believe this answer much more).
'g' placed inside 'nude' is 'NUDGE'.

'being' acts as a link.

Can you help me to learn more?

(Other definitions for nudge that I've seen before include "Gentle push" , "Push gently" , "---. ---, wink, wink (Monty Python)" , "Gentle prod" , "Remind (with the elbow?)" .)

I've seen this clue in The Telegraph.

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