Impression of how it feels to be at sea in a storm? (5,4)

'how it feels to be at sea in a storm?' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'impression' is the wordplay.
I cannot quite understand how this works, but
'impression' could be 'idea' (I've seen this in another clue) and 'idea' is found within the answer.
The remaining letters 'rough' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'of' acts as a link.

Can you help me to learn more?