Many returned papers are quite dull (6)

I believe the answer is:

stolid

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'quite dull' is the definition.
'stolid' can be an answer for 'dull' (similar in meaning). I am unsure of the 'quite' bit.

'many returned papers' is the wordplay.
'many' becomes 'lots' (lots of something).
'returned' shows that the letters should be reversed in order.
'papers' becomes 'ID' (identifying documents are one's 'papers').
'lots' written backwards gives 'stol'.
'stol'+'id'='STOLID'

'are' acts as a link.

Can you help me to learn more?

(Other definitions for stolid that I've seen before include "Strongly built" , "Unemotional - dense" , "Not excitable, unemotional" , "Impassive, unemotional" , "cool" .)

I've seen this clue in The Irish Times.

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