More tatty room pricey, oddly next to river (6)

I believe the answer is:

ropier

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

'more tatty' is the definition.
Both the definition and answer are comparative adjectives. Maybe they are linked in a way I don't understand?

'room pricey oddly next to river' is the wordplay.
'oddly' means one should take alternating letters (letters in the odd-numbered positions are used).
'next to' is a charade indicator (letters next to each other).
'river' becomes 'r' (abbreviation for river).
'room'+'pricey'='roompricey'
The alternate letters of 'roompricey' are 'ropie'.
'ropie'+'r'='ROPIER'

Can you help me to learn more?

(Another definition for ropier that I've seen is " More stringy".)

I've seen this clue in The Telegraph.

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.