Like bloody tissue, rank one in bog (9)

I believe the answer is:

marrowish

I'm a little stuck... Click here to teach me more about this clue!

'like bloody tissue rank one in bog' is the definition.
I can't tell whether this defines the answer.

'rank one in bog' is the wordplay.
'rank' becomes 'row' (I've seen this in another clue).
'one' becomes 'i' (Roman numeral).
'in' means one lot of letters goes inside another.
'bog' becomes 'marsh' (I've seen this in another clue).
'row'+'i'='rowi'
'rowi' inserted inside 'marsh' is 'MARROWISH'.

Can you help me to learn more?

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.