Roland's a rising star! (4)

I believe the answer is:

rats

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

'roland's a' is the definition.
I can't judge whether this definition defines the answer.

'rising star' is the wordplay.
'rising' is a reversal indicator (going up in a down clue).
'star' back-to-front is 'RATS'.

Can you help me to learn more?

(Other definitions for rats that I've seen before include "Annoyed expression" , "Snoopy's imprecation - vermin" , "were piped away" , "Damn" , "Blast" .)

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