Mostly fairly quiet like Lloyd-George (5)
I believe the answer is:
welsh
'mostly fairly quiet' is the definition.
Although both the answer and definition are adjectives, I cannot understand how one could define the other.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for welsh that I've seen before include "Default on bet in Wales?" , "Cymric" , "From Aberystwyth, perhaps" , "So-called rabbit" , "Of bookie, decamp without paying out winnings" .)